257 weatherby
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MudRunner2005
Well-Known Member
.25 cal 131g .330G7 bullet from Blackjack Bullets for you to drool on ...
.25-06 AI 40º Shoulder with the Blackjack 131 ACE...
View attachment 101056
.25-06 AI 40º Shoulder with the Blackjack 131 ACE...
View attachment 101056
Looks nasty, Ackley Improved makes all the old chamberings look sweet.
MudRunner2005
Well-Known Member
Not only does it look 1000 times better and more badass, but it actually improves the performance to nearly equal the .257 Weatherby, but does so with about 10+ grains LESS powder. The AI case design improves case life, handles chamber pressures better, increases performance & capacity, is easier on your bolt's lugs, and helps prevent brass from growing so much. So, it's functional, as well.
IMO, the .25-06 AI 40º should have been what the .25-06 Remington was. Those old school heavy-tapered walls and low shoulder angles are extremely outdated and useless in today's technological world of guns and ammo.
The only reason they were designed that way was because 1, most cases still used cordite powder in the late 1800's/early 1900's, and some cases were designed to use it in stick-form (like the .300 H&H, and .375 H&H), and 2, because it was needed for positive extraction and was once thought to be a better design to prevent cases getting stuck in the chamber, especially in the Browning 1919 machineguns. Same reason the .50 BMG is so heavily tapered for use in the M2 (Ma' Deuce) machinegun. Which was developed in 1933.
However, today, the heavy-taper and low shoulder angles are completely outdated. Today's tech allows us to use 40º shoulders and nearly straight walls, because we know that this design helps the case to grab the chamber walls better during firing, which helps keep excess pressure off the bolt lugs, creating less potential for a bolt failure or receiver damage.
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