moosekiller99
Well-Known Member
I have exclusively used Winchester brass in my Ruger M 77 that I weight sorted years ago. As I am running out of usable pieces I decided to begin load development with the Remington brass that was also sorted but never used in this rifle. The Rem brass is heavier than the Win brass by 8-15 grains in some pieces which means lighter charges to obtain similar velocity and pressure. Using some math I calculated that the 61.0 load I use in the 187 gr Win brass should be reduced to 58.0 grains in the 197 gr Rem brass. I of course will work up to this load weight and chrono each incremental load as I approach my math predicted load. I know there are numerous variables that I am ignoring in this process, but I am hoping my end result shows a close correlation between the two variables (brass and charge weight). The current components are: 3000 fps using Win brass; Win Primer; 150 grain Nosler Partition and 61.0 grains of Reloder 26. Same load with Berger 150 grain VLD's is 3010 - 3020 fps with nearly same POI at 100 yds.
So, any thoughts whether my methodology is sound?
So, any thoughts whether my methodology is sound?