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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Lapua Mag barrel
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<blockquote data-quote="Longshot38" data-source="post: 243985" data-attributes="member: 11627"><p>You are probably looking at more of a 200-300 fps velocity loss. Remember that slow burning powder thing I mentioned earlier. With that short of a barrel I doubt you will reach optimum chamber pressure before the bullet exits the barrel. Now if you are lucky and do a lot of load development you could probably manage only about 100 fps loss if you used faster burning powder. </p><p></p><p>It is like this. In calibers with smaller case capacities a short barrel is a good thing for several reasons. But with large rounds such as these there is a lot of SLOW burning powder behind that bullet that needs to burned up prior to the bullet leaving the barrel. You simply can't burn up that much powder in a 20 inch barrel and you will end up with a combination flame thrower/rifle. </p><p></p><p>Am I saying that it is impossible to have a good accurate 338 with a short barrel, no, just saying that these rifles really NEED a 26+ inch barrel to get the most out of them. So if you have your heart set on that 338LM with a 20 inch barrel go ahead and do it. But the answers you'll get here will all say the same thing. For this round long barrels are good.</p></blockquote><p></p>
[QUOTE="Longshot38, post: 243985, member: 11627"] You are probably looking at more of a 200-300 fps velocity loss. Remember that slow burning powder thing I mentioned earlier. With that short of a barrel I doubt you will reach optimum chamber pressure before the bullet exits the barrel. Now if you are lucky and do a lot of load development you could probably manage only about 100 fps loss if you used faster burning powder. It is like this. In calibers with smaller case capacities a short barrel is a good thing for several reasons. But with large rounds such as these there is a lot of SLOW burning powder behind that bullet that needs to burned up prior to the bullet leaving the barrel. You simply can't burn up that much powder in a 20 inch barrel and you will end up with a combination flame thrower/rifle. Am I saying that it is impossible to have a good accurate 338 with a short barrel, no, just saying that these rifles really NEED a 26+ inch barrel to get the most out of them. So if you have your heart set on that 338LM with a 20 inch barrel go ahead and do it. But the answers you'll get here will all say the same thing. For this round long barrels are good. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Lapua Mag barrel
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