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Long Range Hunting & Shooting
How do you decide on an improved cartridge?
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<blockquote data-quote="J E Custom" data-source="post: 1512627" data-attributes="member: 2736"><p>There are many opinions on which shoulder angle is best, so you will get many opinions.</p><p></p><p>The things I consider when improving a cartridge are =</p><p>1= does it realy add much/any improvement to the potential velocity.</p><p>2= Is it easy to fire form and can you shoot parent case ammo in it with good accuracy. (PO Ackley did lots of test for this and settled on 40o shoulder as the optimum angle and .004 thousandths shorter chambers for the parent case. </p><p>3= Is it a staggered feed or center feed. (Staggered feed mag boxes don't particularly like shoulder angles over 25o and tend to damage the bullet point because it has to make a double S to chamber).</p><p></p><p>There are several reasons for "Improving" a cartridge and these have been my findings.</p><p></p><p>1=Improved efficiency (More velocity , with less powder).</p><p>2=Slightly more case capacity allowing the use of slower powder.</p><p>3=Longer/better case life because the improved versions tend to lengthen less when fired and don,t need trimming as often if ever.</p><p>4= Often a better more consistent powder burn. (Better SDs and ESs)</p><p></p><p>Deciding on the shoulder angle depends a lot on the firearm type, use,</p><p>type and size of parent case and the needs of the owner.</p><p></p><p>Improving a cartridge is not always a measurable benefit and can be a detriment if all the considerations are though out. Case capacity differences between 30o and 40o is almost immeasurable and best angle must be selected for other reasons. I have tried up to 50o shouldered cartridges and found no advantage. so my recommendation for best improved shoulder angle would be 40o if using a center feed mag, 30o max on a stagger feed, and 25o max for a semi auto.</p><p></p><p>When all the considerations are met in the correct format, The improved cartridges can be amazing and perform better than expected. when they are not. Welllll you know the answer to that.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1512627, member: 2736"] There are many opinions on which shoulder angle is best, so you will get many opinions. The things I consider when improving a cartridge are = 1= does it realy add much/any improvement to the potential velocity. 2= Is it easy to fire form and can you shoot parent case ammo in it with good accuracy. (PO Ackley did lots of test for this and settled on 40o shoulder as the optimum angle and .004 thousandths shorter chambers for the parent case. 3= Is it a staggered feed or center feed. (Staggered feed mag boxes don't particularly like shoulder angles over 25o and tend to damage the bullet point because it has to make a double S to chamber). There are several reasons for "Improving" a cartridge and these have been my findings. 1=Improved efficiency (More velocity , with less powder). 2=Slightly more case capacity allowing the use of slower powder. 3=Longer/better case life because the improved versions tend to lengthen less when fired and don,t need trimming as often if ever. 4= Often a better more consistent powder burn. (Better SDs and ESs) Deciding on the shoulder angle depends a lot on the firearm type, use, type and size of parent case and the needs of the owner. Improving a cartridge is not always a measurable benefit and can be a detriment if all the considerations are though out. Case capacity differences between 30o and 40o is almost immeasurable and best angle must be selected for other reasons. I have tried up to 50o shouldered cartridges and found no advantage. so my recommendation for best improved shoulder angle would be 40o if using a center feed mag, 30o max on a stagger feed, and 25o max for a semi auto. When all the considerations are met in the correct format, The improved cartridges can be amazing and perform better than expected. when they are not. Welllll you know the answer to that. J E CUSTOM [/QUOTE]
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How do you decide on an improved cartridge?
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