Recently took my ultra varmint 22-250 to the range. I had very good results with 36grn of varget and CT silver tip bullets in the 55gr. 38.5 grains of H380 shot decently too. I also tried some of the 52 grain Amax bullets, they shot completely different than the CT's...52grn MK from sierra shot pretty close to same spot as the CT's which I was suprised by.
I use nosler brass for the 22-250, WLR primers and OAL varies between the bullets....the MK i seated to 2.35, amax I went out to 2.425, CT's were right at 2.405. First trip to the range was more or less to break the barrel in and experiement with different powders/bullets to see which one showed the most promise....next trip I'll play with different lengths for the 55 CT's and maybe increment the powder charge by .2 until I get closer to max. Think I've pretty much decided on going with the CT bullets and varget, it was repeatable accuracy....and the most expensive bullet out of the group, go figure.