I developed a load in my 12 twist 22-250 with 52gr hornady bthp with 33gr of varget. Shoots a bug hole 3 shot group at 100 but I shot at 200 and it opened up to about 3-4". Wait it gets better. I put the same load through another 22-250 12 twist I own. Shoots about 1.5 at 100 then it shrinks to about 3/4" at 200. What's going on here.