With my .300 Win out of a Ruger 77, shooting 180 gr NP's, the velocity difference between identical weights of an old lot of MRP and a much newer lot of RL-22 is running usually 25fps or less. This is about what I would expect from normal lot-to-lot variations with any powder.

I don't remember the exact charge weight, but it's around 74.0gr, well below the max shown by Alliant for a 180gr Speer Spitzer and what Norma shows for a 180gr NP or Oryx. The load reliably chronos a little above 3000fps out of my rifle. Also, both max loads shown on both Alliant for RL-22 and Norma for MRP are almost identical for similar bullets.

Like HunterJim, N205 used to be my powder of choice for that rifle.

Last edited by Skeezix; 05/25/12. Reason: correct error
Bring enough gun and know how to use it.

Know that it is not the knowing, nor the talking, nor the reading man, but the doing man, that at last will be found the happiest man. - Thomas Brooks (1608-1680)