I've been noticing something. When I shoot at targets off my porch to test rounds I usually shoot standing with both hands about 10-15 yards to test for groupings. But yesterday I heard others say to use a bench or whatever. So I used my rail around the porch and can't hit crap, pattern goes to about 6-8". But then I stand and shoot offhand again and things really tighten up. Seems like using a brace would really help but far from it. For me anyway. Any ideas as to why ?