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Long Range Hunting & Shooting
The 27 Nosler, it's official!
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<blockquote data-quote="David Emerson" data-source="post: 1828512" data-attributes="member: 112579"><p>Highdrum I agree 100%. With one disclaimer. You can have too much of a good thing. Once you go over a certain case capacity to bore you can actually go backwards. I had a reamer made for the 6.5x300 win mag with a 30 degree shoulder. It equals the 6.5x300 weatherby and outdoes the 26 nosler with 10 grains less powder. You can only run so much volume with a certain size bore. 7rum vs 28 nosler is a good example. When I was young and stupid I had a 300 weatherby. 30x378.Whooo. The barrel was a 10 twist lilja. It was chambered to a 300 weatherby. Opened it to a 30x378. With the powders available then I gained recoil and noise but no gain in speed. Now with the powders we have it is amazing what can be had from a smaller case. The 6 creedmoor. Speers new data shows a 100 at over 3300 with a 100gr. 24 inch barrel with R26. You have to push a 240 right to the top and some barrels will not do it. What I do is run up until .001 head expansion with a NEW case. and if the primer pockets start to open after several shots I back off a bit. But as you say with Lapua or Peterson brass even that is too hot. With them the chronograph is your friend. My old mentor in Billings has a saying I like. What is the difference between a 30x338 and a rum? About 2 clicks <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> .And as we both know your best accuracy is usually backed off a touch. Life is much easier if we run up towards the top in capacity for a certain bore size. But reach the top and usually you get a temperamental beast.</p></blockquote><p></p>
[QUOTE="David Emerson, post: 1828512, member: 112579"] Highdrum I agree 100%. With one disclaimer. You can have too much of a good thing. Once you go over a certain case capacity to bore you can actually go backwards. I had a reamer made for the 6.5x300 win mag with a 30 degree shoulder. It equals the 6.5x300 weatherby and outdoes the 26 nosler with 10 grains less powder. You can only run so much volume with a certain size bore. 7rum vs 28 nosler is a good example. When I was young and stupid I had a 300 weatherby. 30x378.Whooo. The barrel was a 10 twist lilja. It was chambered to a 300 weatherby. Opened it to a 30x378. With the powders available then I gained recoil and noise but no gain in speed. Now with the powders we have it is amazing what can be had from a smaller case. The 6 creedmoor. Speers new data shows a 100 at over 3300 with a 100gr. 24 inch barrel with R26. You have to push a 240 right to the top and some barrels will not do it. What I do is run up until .001 head expansion with a NEW case. and if the primer pockets start to open after several shots I back off a bit. But as you say with Lapua or Peterson brass even that is too hot. With them the chronograph is your friend. My old mentor in Billings has a saying I like. What is the difference between a 30x338 and a rum? About 2 clicks ;) .And as we both know your best accuracy is usually backed off a touch. Life is much easier if we run up towards the top in capacity for a certain bore size. But reach the top and usually you get a temperamental beast. [/QUOTE]
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The 27 Nosler, it's official!
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