Went out yesterday with a new 20" AR build and 5 different loads. 3 Factory ammo loads and 2 hand loads and I can tell you none of them had good standard deviations numbers..... Lowest factory SD was 21.43 and this was IMI HPBT Match the other was 35 and 37. My hand loads (which usually run me 8-12 SD in other rifles before) was giving my 26 for one, 29 for the other. Now this is a brand new build, first time out...... It has an adjustable gas block. I was also shooting a LabRadar that isnt suppose to be affected by the weather even though it was raining. Just wondering if it might of been the rifle versus the loads?