We choreographed Weatherby factory Ammo versus hand loads punching paper with 2 of our 257WBY's and the factory loads seemed to be all +/- 40-50 fps or so. Hand loads were not much different actually - slightly better of course, but not that much if memory serves me correctly.
The velocity was, however, lower than what was listed, by 80-90 fps (for factory ammo).
I'm no expert - and don't know if that's typical or not for "premium" ammo but both rifles shot moa and the hand loads*** seemed a little better - but again, marginally.
***This was also a load he had developed over a few sessions that was on the top end of towards the high pressure maxes.
|