Does anyone use Win760 powder in their 270 hand loads? I started out with it and Hdy 130gr SPs and eventually developed a decent load that shoots between cloverleaves and 1.5 MOA 4 shot groups. The load is 52.0gr W760, GM210 OAL 3.280. The equipment is a Leopold 3-9 X 40 on a Browning BAR 22" barrel.
But with that mix I only get velocities up to about 2780fps, more powder and the groups become inconsistent and pressure builds.
H4350 has not solved the velocity problem and not increased accuracy. I developed a 130gr TSX load of 54.0gr 4350, and that yields about 2860fps. Seating the bullets .010 deeper and its 2930fps but excessive pressure signs are happening; flattened primers and headstamp of ejector pin. One Winchester case even ruptured and it had only been reloaded a few times!
(I'll add that the 110gr Sierra Pro Hunters hold consistent sub MOA with the W760 - 56.7gr, going out at about 3200fps.)
For these lead free TSX hunting bullets (soon trying 130gr GMX) I would like to boost the velocity another 100 - 200 fps without the excessive pressure.
Any suggestions based on your experiences?
I have not tried anything slower but I have some RL22, IMR4831, (and H1000 which I guess is too slow).
Thanks in advance, guys.