I have three 7x57s , a model 700 remington, a 98 mauser built by mauser, and a bruno model 21 or 22 ( small ring mauser). I have not been able to get over about 2650 accurately with 139 gr hornady, or nosler ballistic tip 140 with any of them. and I have tried numerous powders such as IMR 4350 and H4350 4064 but none of the really modern ones such as big game hunter or RL17 etc. These loads were not really hot loads, but were full power loads, judging from extraction, look of primer etc. These loads were all extremely accurately averaging i inch or less for all power charges s I worked up. when they started opening up I backed off. but the chromo said 2600plus. I also have a winchester 70 7mm08 that I get 2850 from, accurately. I have sort of lost interest jn the 7x57 because I haven't been able to get adequate velocities from it.. Don't know what I did wrong. Its not as if Ill starve from lack harvested game as Im too much of a looney for that.
I shot 150 gr Remington Corelokts at 2700 out of my 20" model 21 with no pressure signs, at this it was a joy to shoot, to the point of sitting down and going through seventy rounds at the bench for fun, 1/2 gr more and it knocked your tits off, rattled your teeth, and jumped out of the left hand.
The powder I used was ar2209.
added, same load gave me an even 2800 fps out of a Waffenfabrik Mauser...and it was a pussy to handle with the 150 gr Corelokts.
