Icon Logo Gun Mart

Reloading Basics Bullets: Part 2

Reloading Basics Bullets: Part 2

Once you have decided what type of bullet you are going to use, in terms of bullet construction and type, it is very important to match it to your particular gun. Usually, bullets are sold with most of the information you need shown on the box; calibre, diameter, weight, type etc. and this will generally be enough to ensure that they will work in your gun. One thing you will hardly ever see on the box, however, is the length of the bullet, and this is a vital factor when choosing the optimum bullets for your gun. This issue does make a vast difference to the performance of your finished ammo in your gun; so, is well worth some detailed consideration.

Doing the twist

To get the very best performance from your gun, an often overlooked factor is the bullet length and its relationship to the rifling rate or ‘twist’ in your barrel. The rate of the twist is simply the number of inches of barrel over-which the rifling makes one complete turn, expressed for example as 1:10, which means that the rifling makes one turn in 10-inches of barrel. The rate of twist for your gun will be included in the documents that come with it or be available to find online. As a general rule, heavier bullets need a faster or ‘tighter’ twist rate to stabilise them. The principal behind the relationship between the rate of twist of the barrel and the weight of the bullets is this; heavier bullets, in a given calibre, are longer and so have more surface area in contact with the rifling. This means that they are affected differently by the rifling than the way lighter, shorter bullets are. Clearly, the entire length of a bullet is not in contact with the walls of the barrel, due to the taper towards the nose of almost all bullets; but, as the overall length of a bullet of a specific calibre is increased there is a general increase in the amount of surface area in contact with the barrel.

Getting the calculator out

There is a way to calculate the rate of twist best suited to a particular bullet, using a calculation called the Greenhill formula, and this uses bullet length, rather than weight, as the variable factor. The calculation can also be used in reverse to calculate the best length of bullet for your gun and its rate of twist. All figures are in inches. To determine the best rate of twist, the formula divides 150 by the length of the bullet, expressed in calibres, and then multiplies the resulting number by the diameter of the bullet. The following example demonstrates how the calculation works: (See Greenhill Formula chart below.)

story continues below...

While a lot of theories do not always work in practice, this one does. It is the most effective and consistently reliable means of identifying the best bullet for a given gun. The biggest hurdle to overcome is actually getting the length of a given bullet without having to buy some first. Why bullet length does not get included on the packaging is a mystery; but, if you can get hold of this information, the calculation is quick and easy. One fantastic source of bullet lengths, as well as tons of other data for use when reloading, is the QuickLOAD software from JMS Arms, which lists literally thousands of bullet lengths. The same software can also be used to ‘design’ a load for your chosen bullet, allowing you to choose powders, charges etc. and calculate important stuff like pressure and velocity. More on QuickLOAD coming soon.

Tried and tested

I have used this formula numerous times and on several different calibres. With only one exception, it has always allowed me to work out the bullet size that works the best in a given rifle, in terms of accuracy and consistency. The one exception is when I tried it on full wadcutter bullets in .357-calibre. The dimensions of the bullets generate worthless figures, but the bullets themselves are very accurate, one of the many anomalies or the reloading art! When I used the formula to work out the best bullet for my .308 Steyr, it showed that the best match to my gun would be a 190-grain bullet. This was a surprise, as I had been using a 145-grain bullet with acceptable results. Upping to various heavier bullets gradually, I ended up settling on a 180-grain PPU soft point with fantastic results. Coincidentally, the test target supplied with the rifle was produced using 190-grain bullets. I am not sure how long this formula has been around, but it certainly seems to have stood the test of time and still works well.


Reloading is a complicated art and keeping the variables in check is the key to success. This formula allows you to tick bullet size off the list of variables and find the best bullet for a particular gun. Despite having to run the calculation a few times, to get to a bullet length that best matches the twist of your barrel, and then finding a bullet of that precise length, it is a very useful and worthwhile tool. When you have found the right bullet, all you need to do is consult available reloading data, to find a suitable and safe powder charge for it. I definitely recommend that you give this a go, the results will optimise your bullet to rifle match and so improve the overall performance of your reloads. When you are starting reloading for the first time, it gives you a quick and easy way to start off with the right bullet.


Norman Clark Gunsmiths normanclarkgunsmith.co.uk
Henry Krank & Co henrykrank.com
JMS Arms jmsarms.com
1967 Spud Reloading Supplies 1967spud.com
Hannam’s Reloading Ltd hannamsreloading.com


  • order viagra 100mg generic <a href="https://rtsildenafil.com/">pfizer viagra</a> cialis next day delivery

    Default profile image
    15 Aug 2022 at 01:21 AM
  • purchase metronidazole generic <a href="https://augmentiln.com/">buy augmentin 625mg sale</a> order metformin 1000mg pill

    Default profile image
    10 Aug 2022 at 11:48 PM
  • purchase azithromycin generic <a href="https://prednisolonel.com/">buy prednisolone online</a> order metformin 500mg online cheap

    Default profile image
    09 Aug 2022 at 04:39 PM
  • tadalafil 10mg over the counter <a href="https://provipill.com/">modafinil online</a> purchase sildenafil without prescription

    Default profile image
    08 Aug 2022 at 10:24 AM
  • buy generic fluconazole <a href="https://ciprotbs.com/">cipro us</a> sildenafil 25 mg

    Default profile image
    07 Aug 2022 at 03:58 AM
  • order ondansetron online <a href="https://zofrapl.com/">purchase zofran for sale</a> buy finasteride 5mg generic

    Default profile image
    05 Aug 2022 at 08:37 AM
  • buy zantac online <a href="https://tamsulosinl.com/">brand flomax</a> flomax pill

    Default profile image
    04 Aug 2022 at 01:58 AM
  • cialis cost <a href="https://levofloxacinl.com/">buy levofloxacin 500mg for sale</a> dutasteride oral

    Default profile image
    02 Aug 2022 at 07:30 PM
  • esomeprazole 20mg usa <a href="https://phenergpl.com/">order phenergan online</a> order generic tadalafil 40mg

    Default profile image
    01 Aug 2022 at 12:32 PM
  • buy sildalis without prescription <a href="https://lamotriginep.com/">buy lamotrigine 50mg generic</a> losartan uk

    Default profile image
    31 Jul 2022 at 05:11 AM
  • order isotretinoin pill <a href="https://suhagrapls.com/">buy suhagra sale</a> order sildenafil 100mg generic

    Default profile image
    29 Jul 2022 at 05:53 PM
  • sildenafil over the counter <a href="https://edspill.com/">where to buy otc ed pills</a> deltasone for sale online

    Default profile image
    28 Jul 2022 at 10:26 AM
  • methotrexate 2.5mg uk <a href="https://metoclopramy.com/">brand reglan 10mg</a> reglan 10mg cheap

    Default profile image
    27 Jul 2022 at 02:36 AM
  • order flexeril sale <a href="https://clopidogrely.com/">buy clopidogrel 75mg without prescription</a> cost clopidogrel

    Default profile image
    25 Jul 2022 at 07:05 PM
  • zetia price <a href="https://domperidonebc.com/">domperidone drug</a> motilium price

    Default profile image
    24 Jul 2022 at 02:40 AM
  • order sildenafil 50mg <a href="https://rosuvastans.com/">rosuvastatin 20mg pills</a> buy tadalafil 40mg online cheap

    Default profile image
    22 Jul 2022 at 05:06 AM
  • priligy pill <a href="https://diltiazemns.com/">generic diltiazem 180mg</a> allopurinol 100mg without prescription

    Default profile image
    20 Jul 2022 at 11:54 PM
  • baricitinib 4mg price - <a href="https://metforminf.com/">metformin 1000mg sale</a> lisinopril 10mg generic

    Default profile image
    18 Jul 2022 at 03:13 PM
  • brand hydroxychloroquine - <a href="https://viagsildef.com/">sildenafil overnight</a> cenforce 50mg canada

    Default profile image
    16 Jul 2022 at 08:44 AM
  • gabapentin without prescription - <a href="https://gdoxycycline.com/">purchase stromectol pill</a> covid and ivermectin

    Default profile image
    14 Jul 2022 at 09:59 PM
  • deltasone 10mg usa - <a href="https://isotretinoint.com/">buy accutane 40mg pill</a> buy prednisolone 5mg sale

    Default profile image
    13 Jul 2022 at 03:49 AM
  • top ed drugs - <a href="https://tadalafilsde.com/">cialis 10mg generika rezeptfrei kaufen</a> sildenafil generika rezeptfrei kaufen

    Default profile image
    11 Jul 2022 at 05:06 PM
  • fildena cheap - <a href="https://cefuroximel.com/">purchase cefuroxime generic</a> purchase viagra pill

    Default profile image
    10 Jul 2022 at 07:30 AM
  • order metronidazole 400mg - <a href="https://metronidazoled.com/">buy metronidazole online cheap</a> buy cephalexin for sale

    Default profile image
    09 Jul 2022 at 03:08 AM
  • finasteride 1mg over the counter - <a href="https://finasterider.com/">buy finasteride 5mg sale</a> ciprofloxacin 500mg without prescription

    Default profile image
    07 Jul 2022 at 07:28 PM
  • buy zofran 8mg without prescription - <a href="https://valacyclovirs.com/">order valacyclovir online cheap</a> order generic valacyclovir 500mg

    Default profile image
    05 Jul 2022 at 10:31 AM
  • tadalafil 20mg brand - <a href="https://tadalafilpr.com/">cheap tadalafil generic</a> buy generic flomax

    Default profile image
    03 Jul 2022 at 11:47 AM
  • levofloxacin online - <a href="https://dutasterider.com/">avodart 0.5mg brand</a> tadalafil 10mg tablet

    Default profile image
    01 Jul 2022 at 10:39 PM
  • cozaar for sale online - <a href="https://esomeprazolen.com/">buy nexium 20mg online</a> promethazine 25mg cost

    Default profile image
    29 Jun 2022 at 07:20 PM
  • clopidogrel us - <a href="https://tmethotrexate.com/">cheap methotrexate 2.5mg</a> cheap metoclopramide

    Default profile image
    28 Jun 2022 at 02:36 AM
  • order cyclobenzaprine without prescription - <a href="https://rcolchicine.com/">buy gloperba for sale</a> buy inderal 10mg without prescription

    Default profile image
    26 Jun 2022 at 09:12 AM
  • order isotretinoin sale - <a href="https://risotretinoin.com/">accutane over the counter</a> buy generic tetracycline 500mg

    Default profile image
    24 Jun 2022 at 04:15 PM
  • buy provigil online - <a href="https://rerectpill.com/">best ed pills</a> budesonide tablet

    Default profile image
    22 Jun 2022 at 06:30 PM
  • viagra 100mg tablet - <a href="https://rsildenafilr.com/">sildenafil without a doctor’s prescription</a> cheap tadalafil 5mg

    Default profile image
    21 Jun 2022 at 06:25 AM
  • buy cenforce 50mg generic - <a href="https://xdomperidone.com/">domperidone 10mg generic</a> motilium 10mg price

    Default profile image
    19 Jun 2022 at 09:35 PM
  • order tadalafil 20mg online - <a href="https://edtadalsfil.com/">cheap cialis online</a> viagra 100mg price

    Default profile image
    14 Jun 2022 at 09:31 PM
  • order synthroid 150mcg for sale - <a href="https://desloratadi.store/">buy desloratadine pill</a> cheap plaquenil

    Default profile image
    13 Jun 2022 at 10:13 AM
  • buy ventolin inhalator generic - <a href="https://essayslw.com/">buying a term paper</a> order dapoxetine 60mg pill

    Default profile image
    11 Jun 2022 at 10:36 PM
  • brand levitra - <a href="https://pregabalin.store/">order pregabalin 150mg online</a> order generic clomid 100mg

    Default profile image
    10 Jun 2022 at 07:39 AM
  • lisinopril usa - <a href="https://hydlisinopr.com/">lisinopril ca</a> tenormin online

    Default profile image
    08 Jun 2022 at 07:38 PM
  • buy glucophage generic - <a href="https://metforminx.store/">buy glucophage 500mg online</a> order amlodipine for sale

    Default profile image
    07 Jun 2022 at 06:57 AM
  • plaquenil tablet - <a href="https://plaquepll.com/">purchase plaquenil generic</a> baricitinib drug

    Default profile image
    05 Jun 2022 at 05:53 PM
  • lasix 100mg without prescription - <a href="https://doxycyclinet.com/">doxycycline 100mg brand</a> stromectol for lice

    Default profile image
    04 Jun 2022 at 03:01 AM
  • prednisolone 40mg tablet - <a href="https://predsolone.store/">order prednisolone 20mg pills</a> sildenafil 50mg tablets

    Default profile image
    02 Jun 2022 at 10:50 AM
  • amoxil canada - <a href="https://edssilen.com/">cheap sildenafil 100mg</a> sildenafil 100mg price

    Default profile image
    31 May 2022 at 08:00 PM
  • prednisone 10mg cheap - <a href="https://edpill.store/">cheap erectile dysfunction pills</a> accutane 40mg sale

    Default profile image
    30 May 2022 at 10:59 AM
  • cialis 10mg - <a href="https://provigpill.store/">modafinil 200mg us</a> buy provigil 100mg sale

    Default profile image
    29 May 2022 at 02:00 AM
  • order doxycycline 100mg generic - <a href="https://doxycyclineg.store/">doxycycline for sale</a> cialis from canada

    Default profile image
    27 May 2022 at 05:34 AM
  • ivermectin lotion 0.5 - <a href="https://stromectolg.store/">stromectol over counter</a> order levitra generic

    Default profile image
    25 May 2022 at 04:29 PM
  • amoxicillin 1000mg drug - <a href="https://amoxicillinc.store/">amoxicillin 1000mg cheap</a> purchase vardenafil for sale

    Default profile image
    24 May 2022 at 07:57 AM
  • ampicillin price - <a href="https://ciproflox.store/">generic ciprofloxacin 1000mg</a> cialis 20mg pills

    Default profile image
    22 May 2022 at 04:58 AM
  • ceftin 250mg us - <a href="https://cefuroximex.store/">cefuroxime brand</a> tadalafil 40mg oral

    Default profile image
    20 May 2022 at 08:02 PM
  • budesonide online buy - <a href="https://tadalafde.com/">purchase cialis online cheap</a> purchase antabuse without prescription

    Default profile image
    19 May 2022 at 08:19 AM
  • fildena tablet - <a href="https://stromectolx.store/">ivermectin for sale</a> ivermectin for sale

    Default profile image
    17 May 2022 at 08:02 PM
  • order cephalexin generic - <a href="https://cephalexinx.store/">cephalexin 500mg generic</a> erythromycin price

    Default profile image
    15 May 2022 at 10:13 PM
  • buy sulfamethoxazole generic - <a href="https://bactrimx.store/">order bactrim online cheap</a> viagra 150mg uk

    Default profile image
    13 May 2022 at 06:28 PM
  • buy clavulanate for sale - <a href="https://flagylgn.store/">order cialis 40mg pills</a> buy tadalafil for sale

    Default profile image
    11 May 2022 at 10:52 AM
  • purchase prednisolone - <a href="https://prednisolonex.store/">order prednisolone 20mg online</a> guaranteed cialis overnight delivery usa

    Default profile image
    08 May 2022 at 06:19 PM
  • sildenafil 20 mg - <a href="https://bestusasild.com/">viagra 100mg uk</a> sildenafil 50mg canada

    Default profile image
    03 May 2022 at 11:48 AM
  • Reloading the bullets requires momentum we had learn all about momentum in the book of physics. By the help of https://www.bestbritishwriter.com/essayontime-co-uk-review/, you can purchase the book that have all the topics about momentum and velocity with respect to gun and a bullet.

    Default profile image
    Darcy Burrowes
    16 May 2020 at 09:16 AM
  • Reloading the bullets requires momentum we had learn all about momentum in the book of physics. By the help of https://aussiessayservices.com/essaydot-com-review/, you can purchase the book that have all the topics about momentum and velocity with respect to gun and a bullet.

    Default profile image
    Mariam Killian
    16 May 2020 at 09:14 AM
  • Great post! I didn’t knowral of these resources and I’m going to go check them out now!

    Default profile image
    Helenn mary
    20 Nov 2019 at 06:51 AM
  • And for all the people on this website I would recommend https://my.wealthyaffiliate.com/donnadiaz/blog/the-common-difference-between-single-men-and-women to discover the common difference between single men and women. You are welcome!

    Default profile image
    John Howard
    14 Sep 2019 at 12:29 PM