Actually the SAAMI max. average for the .270 Win. is 54,000 CUP
The maximum published online Hodgdon loads are maximum in my rifle. If I go half a grain higher I get pressure signs e.g. stiff bolt lift. Even with 130's, if using Nosler Accubonds, I have to drop down to 59 grain H4831sc from my usual 59.5 grains (60 grains being the maximum online Hodgdon load). Perhaps the SAAMI maximum pressure limit has been revised from 52,000 CUP to 54,000 CUP if you're saying it is 54,000 CUP? Sure, in some rifles you can safely go slightly higher that maximum published loads...but not in mine. As previously stated, I get around 2750 fps with the Hodgdon maximum online published load with 150's. Sure you can sacrifice handiness and put a 26" barrel on a .270, you could put a 28" barrel on if you want and get even more velocity. But who wants to carry around a .270 with a 26" barrel? And if you can safely load the 150's with H4831sc to around 2900 fps, you'd be able to load the 140's and 130's faster than average, which would mean that the large difference in velocity between the 130's, 140's versus the 150's with H4831 is still there. Also, they can't make a 150 grain .270 projectile than gets maximum b.c. in a 10 twist barrel and that stabilizers in a 10 twist barrel at the same time, that has a good b.c. However, they can make a 130 or a 140 grain projectile that has a reasonable b.c. for its weight that does stabilise and also gets maximum b.c. in a 10 twist. So you have the problem of H4831sc not being able to push the 150's anywhere close to what it can push the 130's and 140's, plus the relatively poor b.c. of 150 grain projectiles that run properly (get their maximum b.c. and also stabilize) in a 10 twist barrel. Now if you just want the 150's in a .270 for close range where b.c. doesn't matter, then fine, but there are better options than a .270 with a 24" barrel and a long action for close range work.
