10-02-2012, 09:49 PM
The Hornady projectile has a nice short bearing surface but the scramble is always to balance the powder with the primer and the case volume. Hornady have a unique advantage in being able to adjust the powder to the primer and examine what they are doing to the internal ballistics. Plus they make great bullets.
Given the question I would probably start not with a 123 g bullet but with a Lapua 108 Scenar or a 100 Berger. This opens the number of available powders that are suitable for the case volume and bullet weights and shortens the bearing surface.
The crux is that the the little case is always full of powder so it is essentially consistent. The problem is that the case is always full of powder so it amplifies any tiny deviations in the components or their assembly into ammunition.
My start would be once fired Lapau brass. Clean the primer pocket and call it good. Do not polish the cases. Use the 108 Scenar on a maximum charge of Tac or the equivalent Hodgdon powder. (might try leverevolution) and a minimum neck tension (Redding dies and Dillon case lube allowed to set up). Might even allow the bullets to tarnish a bit. Then play primers. CCI #450 CCI #400 WSRM maybe Remington. Guess would be the CCI.
We kind of already do this for the factory guns and we accuracy test all the GDMR and GSR models as well as a lot of others. If the chamber is in spec it will shoot.
Now if the question is can we find a load that will shoot in the variations of both Grendel and non Grendel chambers with any consistency I would bow to LR1955.
Given the question I would probably start not with a 123 g bullet but with a Lapua 108 Scenar or a 100 Berger. This opens the number of available powders that are suitable for the case volume and bullet weights and shortens the bearing surface.
The crux is that the the little case is always full of powder so it is essentially consistent. The problem is that the case is always full of powder so it amplifies any tiny deviations in the components or their assembly into ammunition.
My start would be once fired Lapau brass. Clean the primer pocket and call it good. Do not polish the cases. Use the 108 Scenar on a maximum charge of Tac or the equivalent Hodgdon powder. (might try leverevolution) and a minimum neck tension (Redding dies and Dillon case lube allowed to set up). Might even allow the bullets to tarnish a bit. Then play primers. CCI #450 CCI #400 WSRM maybe Remington. Guess would be the CCI.
We kind of already do this for the factory guns and we accuracy test all the GDMR and GSR models as well as a lot of others. If the chamber is in spec it will shoot.
Now if the question is can we find a load that will shoot in the variations of both Grendel and non Grendel chambers with any consistency I would bow to LR1955.
