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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Case Capacity Verses Barrel Lenght?
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<blockquote data-quote="James Jones" data-source="post: 104535" data-attributes="member: 8843"><p>the 243 is not realy an "overbore" case meaning that its pretty effecient in the use of its powder from what I have seen in the time I have been reloading the larger the case (more volume) for a set bullet diameter the slower the powder has to be and the slower the powder use the more that load will benifit from a longer barrel as it give the powder enough time to make its pressure over the longer curve.</p><p>lets look at the 308 vs the 30-378 wby we all know that the 308 is a very effecient caliber as its onfte had to get any more noticable velocity out of a 26" barrel than a 22" unless you get into heavy for caliber bullets and that takes slower powder and thats where the longer barrel helps</p><p>now you can take a 308 case fill it to the top with IMR-4350 and crush a bullet say 165gr down in their and it'll shoot with no problems. But if you do the same thing with the 30-378Wby your going to end up with a terrable mess.</p><p>likewise I personaly woulden't see any benifit in chambering a gun for the big Wby case unless the barrel was going to be in the 26" plus range otherwise your going to be close the same velocity class that a 300wby can get burning 20grs less powder.</p><p>so if your building a 308 to shoot he 175gr Match Kings fast enough to get to 1000yds then all you need is a 20" , yea a 24 will give you a little more veocity and a 26 even a little more but in a varmint type profile you would be talking about a pound of weight between the 26" and the 20" but if your gonna try to shoo the 220gr Match kings out as fast as possible then you'll benifit a little more from the 26" tube due to the slower powder used.</p><p>I reload the 308 for a 15" Encore pistol and I can generaly beat any factory loads shot out of a 24" barrel</p><p></p><p>So if you look at the guys shooting big mag case rounds they are probably shooting very slow powders and they need that extra barrel to get all the good from all that powder</p></blockquote><p></p>
[QUOTE="James Jones, post: 104535, member: 8843"] the 243 is not realy an "overbore" case meaning that its pretty effecient in the use of its powder from what I have seen in the time I have been reloading the larger the case (more volume) for a set bullet diameter the slower the powder has to be and the slower the powder use the more that load will benifit from a longer barrel as it give the powder enough time to make its pressure over the longer curve. lets look at the 308 vs the 30-378 wby we all know that the 308 is a very effecient caliber as its onfte had to get any more noticable velocity out of a 26" barrel than a 22" unless you get into heavy for caliber bullets and that takes slower powder and thats where the longer barrel helps now you can take a 308 case fill it to the top with IMR-4350 and crush a bullet say 165gr down in their and it'll shoot with no problems. But if you do the same thing with the 30-378Wby your going to end up with a terrable mess. likewise I personaly woulden't see any benifit in chambering a gun for the big Wby case unless the barrel was going to be in the 26" plus range otherwise your going to be close the same velocity class that a 300wby can get burning 20grs less powder. so if your building a 308 to shoot he 175gr Match Kings fast enough to get to 1000yds then all you need is a 20" , yea a 24 will give you a little more veocity and a 26 even a little more but in a varmint type profile you would be talking about a pound of weight between the 26" and the 20" but if your gonna try to shoo the 220gr Match kings out as fast as possible then you'll benifit a little more from the 26" tube due to the slower powder used. I reload the 308 for a 15" Encore pistol and I can generaly beat any factory loads shot out of a 24" barrel So if you look at the guys shooting big mag case rounds they are probably shooting very slow powders and they need that extra barrel to get all the good from all that powder [/QUOTE]
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