07-27-2013, 10:32 PM
SCR:
A couple of things that you may want to consider.
First, how many five shot groups did you fire before you determined your load wasn't any good? If you shot five each, five shot groups, then you are probably on to something. Something tells me you probably didn't shoot enough to get a real good statistical measure.
I don't see that much difference between your two loads in terms of vertical and horizontal dispersion. Both are about the same vertically and about the same horizontally. The only real difference is your first load shot four into that cluster and your second, only three.
Given the case capacity of about 30 grains and a gas gun, once you find a load that shoots and is giving you the highest velocity possible within safe limits, you have your load. The notion that it pays to have a short and long range load with a Grendel is kind of negated due to the case capacity.
I would be careful at 28 1/2 grains of 8208 with a 123 A Max. It is safe but I won't make bets that your bolt will last very long before you shear a lug. You may want to look at 2520 or that CFE powder.
Finally, I have never seen a group that open at 100 yards get smaller at farther distances. If your bullets were yawing and pitching that much at 100, the holes would be oblong.
A couple of things that you may want to consider.
First, how many five shot groups did you fire before you determined your load wasn't any good? If you shot five each, five shot groups, then you are probably on to something. Something tells me you probably didn't shoot enough to get a real good statistical measure.
I don't see that much difference between your two loads in terms of vertical and horizontal dispersion. Both are about the same vertically and about the same horizontally. The only real difference is your first load shot four into that cluster and your second, only three.
Given the case capacity of about 30 grains and a gas gun, once you find a load that shoots and is giving you the highest velocity possible within safe limits, you have your load. The notion that it pays to have a short and long range load with a Grendel is kind of negated due to the case capacity.
I would be careful at 28 1/2 grains of 8208 with a 123 A Max. It is safe but I won't make bets that your bolt will last very long before you shear a lug. You may want to look at 2520 or that CFE powder.
Finally, I have never seen a group that open at 100 yards get smaller at farther distances. If your bullets were yawing and pitching that much at 100, the holes would be oblong.