05-23-2020, 05:03 PM
I think I need a better caliper, but wanted to toss my scenario out to the group to confirm. I might also have too high of expectations, or any number of other things...
I know I am currently overworking my brass and trying to dial the shoulder bump back right now.
Using a 10mm case (I am weird, I don't have a 9mm yet) I get the following measurements:
Fired Brass 2.1625, 2.1605, 2.1595 Average: 2.1608
Resized Brass 2.1460, 2.1440, 2.1480 Average: 2.1460
Average shoulder bump is .0148
Research is telling me I should aim for .003 for an auto-loader to get the longest life out of my brass while still functioning reliably.
So here is the issue I am running into, the variability in my measurements is .004
My question is, is it normal for there to be that much variability when measuring? I get about the same amount of variability when measuring base to Ogive on my finished bullets. The Neck tension measurements are closer to .001
I am using Hornady dies with the quick change bushings in a Hornady Lock-n-Load single stage press. Caliper is a generic digital unit that I probably spent $20 on.
I know I am currently overworking my brass and trying to dial the shoulder bump back right now.
Using a 10mm case (I am weird, I don't have a 9mm yet) I get the following measurements:
Fired Brass 2.1625, 2.1605, 2.1595 Average: 2.1608
Resized Brass 2.1460, 2.1440, 2.1480 Average: 2.1460
Average shoulder bump is .0148
Research is telling me I should aim for .003 for an auto-loader to get the longest life out of my brass while still functioning reliably.
So here is the issue I am running into, the variability in my measurements is .004
My question is, is it normal for there to be that much variability when measuring? I get about the same amount of variability when measuring base to Ogive on my finished bullets. The Neck tension measurements are closer to .001
I am using Hornady dies with the quick change bushings in a Hornady Lock-n-Load single stage press. Caliper is a generic digital unit that I probably spent $20 on.