Originally Posted by BobinNH
Originally Posted by bellydeep
OK, so can anyone explain to me why RL26 in the .270 Win can hit 3050 with 150gr bullets;

7mm WSM can hit 3150 with FOUR different 160gr bullets;

But the 270 WSM barely breaks 3100 with 150gr bullets in 1 out of 3 different loadings?



Pressure.

It's all guessing unless you have equipment to measure it.


Wonder what kind of pressure testing Alliant does...

http://www.alliantpowder.com/reload...hellid=63&bulletid=366&bdid=1272

http://www.alliantpowder.com/reload...ight=150&shellid=64&bulletid=181

http://www.alliantpowder.com/reload...ight=162&shellid=72&bulletid=245