I was testing two groups of a FGMM Clone.
The first is 42.2gr of IMR 4064 pushing a Nosler CC 168 in Federal once fired FL sized brass and a CCI200 primer. Flash holes have been deburred. Neck Tension is .002".
The second is the same with a charge of 42.9gr of 4064.
The control is Federal Gold Metal Match 168gr Lot# 321W719.
The rifle is zeroed for the FGMM since that is what I am trying to duplicate. Since I also need to track my cold-bore the FGMM is fired fist. All Chrono testing is at 100 yards from the bench.
The FGMM is dead on. Four rounds were fired because that is what I had left in the box. The last couple of cases of this ammo has been HOT.
1. 2734 fps.
2. 2756 fps.
3. 2745 fps.
4. 2730 fps.
42.2gr IMR 4064
1. 2606 6. 2631
2. 2651 7. 2590
3. 2643 8. 2587
4. 2617 9. 2586
5. 2664 10. 2622
42.9gr IMR 4064
1. 2644 6. 2649
2. 2668 7. 2645
3. 2700 8. 2626
4. 2700 9. 2682
5. 2663 10. 2663
At 100 yards the 42.2 gr groups were 1/4" higher than the 42.9gr groups. The FGMM was dead in the center.
I then moved back to 200 yards prone and fired 10 shot groups at separate targets "round robin" style.
FGMM was dead on. The 42.2 group was 1.5" above the 42.9 group.
I find it interesting that as the velocity moves up the groups are coming down. I can only guess that barrel harmonics are to blame.
I am going to work up towards 44.6gr. That should be a little faster than the FGMM, but it should hit the OBT node for my 26" barrel.
I am about ready to go buy an off the shelf box of FGMM to chrono a different lot. It would be nice if all of Federal's current lots are running this fast. Of course it could just be my chrony, but it was reading right along with Quickload for the 42.9gr loads.
What do you guys think?
The first is 42.2gr of IMR 4064 pushing a Nosler CC 168 in Federal once fired FL sized brass and a CCI200 primer. Flash holes have been deburred. Neck Tension is .002".
The second is the same with a charge of 42.9gr of 4064.
The control is Federal Gold Metal Match 168gr Lot# 321W719.
The rifle is zeroed for the FGMM since that is what I am trying to duplicate. Since I also need to track my cold-bore the FGMM is fired fist. All Chrono testing is at 100 yards from the bench.
The FGMM is dead on. Four rounds were fired because that is what I had left in the box. The last couple of cases of this ammo has been HOT.
1. 2734 fps.
2. 2756 fps.
3. 2745 fps.
4. 2730 fps.
42.2gr IMR 4064
1. 2606 6. 2631
2. 2651 7. 2590
3. 2643 8. 2587
4. 2617 9. 2586
5. 2664 10. 2622
42.9gr IMR 4064
1. 2644 6. 2649
2. 2668 7. 2645
3. 2700 8. 2626
4. 2700 9. 2682
5. 2663 10. 2663
At 100 yards the 42.2 gr groups were 1/4" higher than the 42.9gr groups. The FGMM was dead in the center.
I then moved back to 200 yards prone and fired 10 shot groups at separate targets "round robin" style.
FGMM was dead on. The 42.2 group was 1.5" above the 42.9 group.
I find it interesting that as the velocity moves up the groups are coming down. I can only guess that barrel harmonics are to blame.
I am going to work up towards 44.6gr. That should be a little faster than the FGMM, but it should hit the OBT node for my 26" barrel.
I am about ready to go buy an off the shelf box of FGMM to chrono a different lot. It would be nice if all of Federal's current lots are running this fast. Of course it could just be my chrony, but it was reading right along with Quickload for the 42.9gr loads.
What do you guys think?