valleyforge.1777
Member
- Joined
- May 4, 2013
- Messages
- 122
I sighted in my AR rifle at 50 yards with Aimpoint PRO and Burris 3x magnifier from seated position at bench. Target was essentially in-line with the rifle bore, or just slightly lower (~4 inches?). Shot groups were fine, small and compact, reproducible mag after mag. Then, when I went prone and fired same rifle, ammo, target (now target was "uphill" relative to my being prone on the ground) the groups were tight, compact, reproducible mag after mag but were about 3 inches below the point of aim. Went back to bench seat and used same rifle, ammo, target and shots were again all POA=POI. Went prone again, tried to be very careful, shots were 3 inches tight group below POA.
What am I doing wrong? Do you have to sight in separately or differently for prone vs. bench rest seated? Just for info, I also shot 100 yards under same conditions, and with bench seated shooting, the 100 yard shots were a little higher at 100 than they were at 50 yards (that is to be expected). At 100 yards from prone, the 100 yard shot group was essentially POA=POI whereas the prone 50 yards shot group was low. In other words, the shot group was lower by about same amount at 50 yards and 100 yards when shooting prone compared to bench seat.
What am I doing wrong?
Rifle is a 5.56/.223 Bushmaster AR 14.5 inch barrel+flash hider from mid-2000's (before BM was bought by Freedom Group/Remington). Ammo is home reloaded 55 gr FMJ-BT over Win748 powder with previously loaded but fully processed brass.
What am I doing wrong? Do you have to sight in separately or differently for prone vs. bench rest seated? Just for info, I also shot 100 yards under same conditions, and with bench seated shooting, the 100 yard shots were a little higher at 100 than they were at 50 yards (that is to be expected). At 100 yards from prone, the 100 yard shot group was essentially POA=POI whereas the prone 50 yards shot group was low. In other words, the shot group was lower by about same amount at 50 yards and 100 yards when shooting prone compared to bench seat.
What am I doing wrong?
Rifle is a 5.56/.223 Bushmaster AR 14.5 inch barrel+flash hider from mid-2000's (before BM was bought by Freedom Group/Remington). Ammo is home reloaded 55 gr FMJ-BT over Win748 powder with previously loaded but fully processed brass.