Rug I've run a 257AI for 25years and used only 51.0gr IMR 4350 and 52.0gr of RL19 from a slow can of powder...both reaching 3050fps from a 21in barrel. You'll be fine. powdr
I just noticed this post and I decided to look to see what I have written down on my reloads with my 257 Improved I built quite a few years ago on a commercial Mauser 98 action with a 24" ER Shaw barrel. I use 51 gr. of IMR 4350 with a Hornady 100 gr. Spire Pt. I see than when I chronographed it, it averaged 3200 FPS. I get no pressure signs and it is one of the most accurate rifles I own. Over the last 10 or so years, I have shot some very nice Mule deer bucks and none have required a second shot!! I have quite a few other rifles, but I always grab the 257 AI when I leave the house.
Just wanted to contribute,
Ken
