I have a bunch of 250 grain Speers loaded over the 59 grain chg of RL-15. My custom mauser sems to like the load.
That being said, I think I will only shoot it in cool weather, and when the batch I have is done, I will see how much velocity a 57 grain load will give me.
I get just under 2600 FPS with the 59 grains.
...tj3006