Paper Patch question

[Kurt]

Dave, I might add. The compression of the powder mostly regulates the groups.
You will see this if you have more than one caliber. You can take a .45-2.1 and use say 68 grains of powder and say compress it .240" to get your accuracy load and anything above and below the groups open up. Now take a .45-2.4 or up to .45-2 7/8. and work up a ladder load to find an accuracy load you will find it pretty close with the same amount of compression if the bullet, primers, and wad stack is the same despite using more powder.
You can fine tune a load with the wad stack you use or primers. Keep the case volume consistent as well as the neck tension. Those two will do a lot keeping the vertical down.
I measure my case volume with something that is consistent in size like table salt or some of the fine ball powder. I do not weigh my cases because they might weigh the same but the inside volume will not be the same. And I anneal the case necks every third shot and trim the case.
It's the inconsistency of the brass or load/bullet that throws the monkey wrench in the hit/miss equation.


Kurt