I've been working on this platform for a year. Most of the issues are resolved except what seems like a over pressure load. I'm using RL19 and 175 MK's, quick load claims no pressure issue and I'm only running at 2809 f/s. Yet the primers are flat (CCI) and occasionally they are pierced. There are ejector marks although very hard to see.
The barrel is a benchmark, 32" with brake. I had overgas issues for awhile and have the adjustable block nearly shut off, at this point is cycles and feeds perfectly.
I wonder if RL19 is to slow for this gun and there is just too much pressure in the barrel for to long. I ran some calculations with QL and at 15" RL22 is at 21607#, RL17 - 18832#, H4350 - 18647# and Varget - 17537# all these loads run the MK at about 2970 f/s.
I don't know what a goal is for pressure at the barrel block but it seems like Varget would be easier on my brass and primers since I'll have a much reduced pressure to cycle and less pressure on the brass while extracting.
What do you think about powder choice?
Thanks
The barrel is a benchmark, 32" with brake. I had overgas issues for awhile and have the adjustable block nearly shut off, at this point is cycles and feeds perfectly.
I wonder if RL19 is to slow for this gun and there is just too much pressure in the barrel for to long. I ran some calculations with QL and at 15" RL22 is at 21607#, RL17 - 18832#, H4350 - 18647# and Varget - 17537# all these loads run the MK at about 2970 f/s.
I don't know what a goal is for pressure at the barrel block but it seems like Varget would be easier on my brass and primers since I'll have a much reduced pressure to cycle and less pressure on the brass while extracting.
What do you think about powder choice?
Thanks
