I am reloading some Sierra 45gr spitzers for my R700 SPS Varmint in .22-250 and am seeing primers backing out 4-5 thou. Using Varget 36.0 and 36.5 grains working up a load. I got excellent accuracy from both loads-5 shots a dime could cover. New Hornady brass, checked with a comparator at the shoulder datum prior to firing at 1.561-1.562. After firing these loads, the fired rounds check out at 1.561-1.562. Fired some factory loads and those are at 1.566 on the comparator. So it appears my brass is not stretching at all during firing with these loads. Lyman 50th says 36 gr of Varget for a starting load, Hodgdon shows 35 gr with a 45 gr bullet. No pressure signs at all. My son has the same rifle and his brass is doing the same thing. I'm thinking a low pressure load, but I really like the accuracy. Don't believe there is a problem, but wanted feedback from you all.