greatnw
06-30-12, 14:04
I hope I'm putting this in the right area, if not feel free to move or l can re-post.
I'm almost finished with my first AR build, a 16" BCM Middy. It will be primaraly a HD weapon after I have obtained proper training with it. In anticipation I've got a good stock of M193 ammo for said training and have been researching HD ammo. I would like to purchase the HD ammo now so I can make sure it runs properly in the gun and because ammo seems to be harder and harder to come by. After reading most all of DocGKR's threads on 5.56 loads I came to the conclusion that Hornady 75gr OTM or something similar would fit my needs perfectly as an effective targer stopper inside my home with barrier penetration not necessary or wanted.
My question is, do I need to be concerned with POA/POI shift at or under 25yrds(most likely 10yrds or less) between my practice ammo and HD ammo? I plan on using a 100m zero or some slight variation of that and my rifle will be iron sighted and have the large aperture up at home. I don't want to have to re-zero for range trips and then re-zero before I come home each time. If this will be an issue would I be better off with a 55gr HD loading that might mimic the M193 better? It seems from reading Molon's post on trajectories that regardless of ammo choice, under 25yrds it shouldnt be a concern, not sure if I'm interpreting the data correctly though and I can't find any comparisons with heavier ammo. Thanks for the help.
I'm almost finished with my first AR build, a 16" BCM Middy. It will be primaraly a HD weapon after I have obtained proper training with it. In anticipation I've got a good stock of M193 ammo for said training and have been researching HD ammo. I would like to purchase the HD ammo now so I can make sure it runs properly in the gun and because ammo seems to be harder and harder to come by. After reading most all of DocGKR's threads on 5.56 loads I came to the conclusion that Hornady 75gr OTM or something similar would fit my needs perfectly as an effective targer stopper inside my home with barrier penetration not necessary or wanted.
My question is, do I need to be concerned with POA/POI shift at or under 25yrds(most likely 10yrds or less) between my practice ammo and HD ammo? I plan on using a 100m zero or some slight variation of that and my rifle will be iron sighted and have the large aperture up at home. I don't want to have to re-zero for range trips and then re-zero before I come home each time. If this will be an issue would I be better off with a 55gr HD loading that might mimic the M193 better? It seems from reading Molon's post on trajectories that regardless of ammo choice, under 25yrds it shouldnt be a concern, not sure if I'm interpreting the data correctly though and I can't find any comparisons with heavier ammo. Thanks for the help.