270WSM and Alliant Power Pro 4000MR

[Carlos88]

Anyone tried this powder with 130 & 140gr Barnes TSX or Nosler 130 & 140gr? I found some data from Speer with 150gr bullets with a max of 61.0grs.

Was thinking of starting at 60.0 and increasing by .3gr and measuring velocities with my Magnetospeed.

Any comments would be welcome.

 

[P7M13]

This powder was originally touted as similar to RL25, but I found its somewhere between RL19 & RL22.
I would start with 58gr and work up in 0.3's to find a good node.

 

[Carlos88]

Thanks. Sage advice. I went back to the Speer data and looked at the charge weights with 150gr bullets and the min & max are almost identical to RL19.