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Long Range Hunting & Shooting
Cutting down barrel to 18 myth?
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<blockquote data-quote="J E Custom" data-source="post: 314496" data-attributes="member: 2736"><p>The 308 was designed around a 18 to 20 inch barrel ,and performs well in this range giving up very little velocity from 20 to18" but it will be about 1 to 200 ft/sec difference.</p><p></p><p>There is an optimum barrel length for all cartridges (The point that the gain becomes less and </p><p>less for each inch of barrel added). Example= I have a 7/08 in a 16" barreled pistol and the </p><p>same load is used in my 20" model 7 Rem. A 120 ballistic tip with 49.5 grs H414 @ 2690 ft/sec</p><p>in the pistol and 3010 in the rifle. I also had a factory 7/08 in a 18.5" barrel and the velocity</p><p>was 2823 ft/sec.</p><p></p><p>So based on these velocities It appears that optimum performance is around 20 to 22" for the</p><p>7/08 size cases.</p><p></p><p>Of course you can use different powders to reach max pressures sooner and get a little more velocity But the only way to match the same velocities is to use a bigger case.</p><p></p><p>I have a rule of thumb based on my experience with different cartridges = A case capacity of 50</p><p>grans of powder or less needs 20 to 22" of barrel to reach the optimum velocity (Not maximum)</p><p></p><p>One with 70grains of capacity needs 24 to 26'' of barrel, and one with 70+ grains needs 26 to</p><p>30 Inches.</p><p></p><p>I know that people use magnum cartridges in pistols but they are very inefficient and the gain </p><p>is not worth the pain and cost. Plus the muzzle blast is very bad because of all the UN burnt</p><p>powder.</p><p></p><p>If you are looking for a 300+ yard rifle with a short barrel I would recomend a 7/08 with a</p><p>20 to 22inch barrel in a short action or a mod 7 Rem.</p><p></p><p>I have killed deer beyond 500 yards with both the rifle and the pistol with 120,140 and 150grain bullets. </p><p></p><p>Just an opinion but I would not cut "any" rifle barrel shorter than 18 inches and "any" long</p><p>range pistol less than 14 Inches.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 314496, member: 2736"] The 308 was designed around a 18 to 20 inch barrel ,and performs well in this range giving up very little velocity from 20 to18" but it will be about 1 to 200 ft/sec difference. There is an optimum barrel length for all cartridges (The point that the gain becomes less and less for each inch of barrel added). Example= I have a 7/08 in a 16" barreled pistol and the same load is used in my 20" model 7 Rem. A 120 ballistic tip with 49.5 grs H414 @ 2690 ft/sec in the pistol and 3010 in the rifle. I also had a factory 7/08 in a 18.5" barrel and the velocity was 2823 ft/sec. So based on these velocities It appears that optimum performance is around 20 to 22" for the 7/08 size cases. Of course you can use different powders to reach max pressures sooner and get a little more velocity But the only way to match the same velocities is to use a bigger case. I have a rule of thumb based on my experience with different cartridges = A case capacity of 50 grans of powder or less needs 20 to 22" of barrel to reach the optimum velocity (Not maximum) One with 70grains of capacity needs 24 to 26'' of barrel, and one with 70+ grains needs 26 to 30 Inches. I know that people use magnum cartridges in pistols but they are very inefficient and the gain is not worth the pain and cost. Plus the muzzle blast is very bad because of all the UN burnt powder. If you are looking for a 300+ yard rifle with a short barrel I would recomend a 7/08 with a 20 to 22inch barrel in a short action or a mod 7 Rem. I have killed deer beyond 500 yards with both the rifle and the pistol with 120,140 and 150grain bullets. Just an opinion but I would not cut "any" rifle barrel shorter than 18 inches and "any" long range pistol less than 14 Inches. J E CUSTOM [/QUOTE]
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Cutting down barrel to 18 myth?
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