03-31-2020, 05:52 PM
With the 120 gold dot. I have seen that being to close to the lands is a bad thing.
I first worked this load up at 2.290 inch's and 28.6 grains of ar-comp. Load shoot great in two rifles but beat the crude out of the brass in my 16 inch rifle.
Backed the seating depth down too 2.270 inches and dropped down and reworked the load. Ended up right back at 28.6 grains but groups much tighter almost the same speed but the brass fired from the 16 inch came out looking much much better.
So my thoughts are in that 16 inch barrel the seating depth of 2.290 was just to close and spiking pressure.
Here is the kicker at 2.290 coal the jump was still like 40 thousands to the lands.
So in my limited experience, I may start out longer but most my loads now end up depending on bullet being 20 to 30 thousands shorter then where I started the work up.
I first worked this load up at 2.290 inch's and 28.6 grains of ar-comp. Load shoot great in two rifles but beat the crude out of the brass in my 16 inch rifle.
Backed the seating depth down too 2.270 inches and dropped down and reworked the load. Ended up right back at 28.6 grains but groups much tighter almost the same speed but the brass fired from the 16 inch came out looking much much better.
So my thoughts are in that 16 inch barrel the seating depth of 2.290 was just to close and spiking pressure.
Here is the kicker at 2.290 coal the jump was still like 40 thousands to the lands.
So in my limited experience, I may start out longer but most my loads now end up depending on bullet being 20 to 30 thousands shorter then where I started the work up.