Grumulkin
Member
Provided your gun shoots 1 MOA with factory ammo your problem is not headspace, flinching, a bad crown, a bad scope or mounting thereof or barrel bedding problems.
IMR 8208 XBR is one of the very few powders I don't weigh individual charges for. After throwing and weighing several dozen charges of this powder I found weights to be so consistent that it wasn't necessary. That said, the weight variations in powder charges you posted above would not explain 4 inch groups. A bullet/powder combination your gun didn't like could definitely cause 4 inch groups; I know from having worked up bunches of loads yearly in a variety of cartridges.
The bullet used for this 200 yard group was plain old cheap Remington Core-Lokts. The brass was all once fired full length resized. I have NEVER weighed cases, bullets, etc. in assembling loads. The only cleaning primer pockets is in a case tumbler. I quite turning necks and uniforming primer pockets a LONG time ago.
IMR 8208 XBR is one of the very few powders I don't weigh individual charges for. After throwing and weighing several dozen charges of this powder I found weights to be so consistent that it wasn't necessary. That said, the weight variations in powder charges you posted above would not explain 4 inch groups. A bullet/powder combination your gun didn't like could definitely cause 4 inch groups; I know from having worked up bunches of loads yearly in a variety of cartridges.
The bullet used for this 200 yard group was plain old cheap Remington Core-Lokts. The brass was all once fired full length resized. I have NEVER weighed cases, bullets, etc. in assembling loads. The only cleaning primer pockets is in a case tumbler. I quite turning necks and uniforming primer pockets a LONG time ago.