Not what you have on hand, but I get excellent accuracy with RL19 in the 7x57 and either 160 or 150 Partitions. If I recall correctly, 47.5 grains of RL19 for the 160 at a moderate velocity, and 50.5 grains with the 150 at a chronographed 2880 fps with the 150. Both in Ruger No.1s, the 160 in an RSI and the 150 in a Krieger 24" barrel 1A. Haven't tried either in the other rifle yet. Both were sub MOA, and the RSI was closer to 1/2" groups with the 160. Best load I've ever used in that rifle for sure. If you can find some RL19, it's worth a try.
