Originally Posted by bwinters
In a 22" barrel, 140's should do 3000 fairly easily. My 150 gr load was 2950 using H4831 in my M77. If it were me, I'd work up to max loads of H4831 or H4350 and see what it does.

Another thought: how much throat/leade does the barrel have? Long throated guns will cause a pressure drop and result in decreased velocity.


Getting an honest 3000 FPS in a 22" barrel with a 140 is about as hard as I am willing to lean on a standard throated 280 & about 2900'ish with a 150.

Some claim more & maybe they are braver than me.

As for powder, I've generally done best with RL-19 with the 140's & RL-22 with the 150's...........either are pretty close & can go either way w/o much issue on the 140's.

Win. 780 is also a decent choice as is 7828, but almost w/o fail the RL-19/22 gives higher velocity.

Here's a target with 140NBT's using 59 gr. of RL-19 in a 22" barrel that is right at the 3000 FPS number. No real pressure signs with easy bolt lift & could have probably used another half a grain.

MM

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