I haven't been reloading too long, but it's been my experience (and was taught to me), that looking for a velocity node is a good start to finding an accurate load. The process worked well on 2 bolt guns I've loaded for, found a node, had SD in the single digits, and was 1/2" moa without fuss.
Finally started doing load development on my Grendel. My guns shoots Factory loaded SST a little over MOA as of late. I established a baseline with factory ammo, 5 shot group, 2410 fps (sd13) and 1.2moa.
Using the same 123gr SST bullet, Fed. GMM ar primers, IMR 8208xbr powder, and all once fired brass I loaded up a bunch of rounds to find a velocity node, to the same base to ogive length measurement as factory ammo. I found a node at 28.2g (or so I thought).
Loaded up 10 of them today, went out and shot 2 5 shot groups with it. I produced a 10 shot combined velocity of 2447fps and SD of 6. I thought I was on the mark (low sd = small groups I thought) until I looked at the groups and saw one was 1.8 moa and the other was 2 moa.
Loaded up some American Gunner to check my gun wasn't messed up... those 5 shots came in at 2399fps, SD of 20, and a 1.1 moa group
Anyone experience good numbers but bad groups before... without it being caused by the gun (proofed by my factory ammo shooting normally)? Any advice?
Finally started doing load development on my Grendel. My guns shoots Factory loaded SST a little over MOA as of late. I established a baseline with factory ammo, 5 shot group, 2410 fps (sd13) and 1.2moa.
Using the same 123gr SST bullet, Fed. GMM ar primers, IMR 8208xbr powder, and all once fired brass I loaded up a bunch of rounds to find a velocity node, to the same base to ogive length measurement as factory ammo. I found a node at 28.2g (or so I thought).
Loaded up 10 of them today, went out and shot 2 5 shot groups with it. I produced a 10 shot combined velocity of 2447fps and SD of 6. I thought I was on the mark (low sd = small groups I thought) until I looked at the groups and saw one was 1.8 moa and the other was 2 moa.
Loaded up some American Gunner to check my gun wasn't messed up... those 5 shots came in at 2399fps, SD of 20, and a 1.1 moa group
Anyone experience good numbers but bad groups before... without it being caused by the gun (proofed by my factory ammo shooting normally)? Any advice?
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