Tag: Ruger American
-
MP 580 Smokeless Rifle Powder
A little while back I saw some MP 580 smokeless powder on American Reloading’s site and it was labeled as “Similar to IMR 4451”. The reference data for it was for a 243 Winchester with a 100gr SP. I figured I would give it a try since the IMR Enduron powders are well regarded. At…
-
MP540 Powder in the 308 Winchester
I made it out to the range with my initial test loads using the American Reloading MP540 powder. It worked very well. This is suppose to be similar to Vihtavuori N540 powder, so I started with their published starting load of 41.7 grains. From the published load data, the expected velocity from a 24″ barrel…