The #1 load recommendation for the 257 Roy here on the campfire is 72 gr of RL -22 with a 100TSX, of course I was working my way up. I figured I'd see some pressure signs before backing off and seeing as I havent reached the coveted 72 gr I didn't expect these speeds without signs of excessive pressure. Now you've got me wondering. It was mid 80's today so it's not like it was cool out. I have clocked factory loaded 100 TSX's in the 3700+ velocities so I wasn't sweating it too much, just thought I was reaping the rewards of hand loading!
Cub,
First off, congrats on the Roy. Very fine cartridge!
3800 is a little high. 3600-3700 is maxed out with the 100's.
You're already very close to book max with 71.5, but if perhaps your freebore length is out of spec(too short),71.5 with a reduced freebore will probably put you over max. Even though Remington is supposed to have the same freebore as the Weatherby(.378), your's may be a tad short. Just a thought.
I agree with the others and would back it off a bit. 3600 range is still flat out smokin and will kill the chit out of any game you would encounter around TX.
