207Shooter
Member
- Joined
- Mar 25, 2021
- Messages
- 7
First off I’d like to thank you guys in this forum for the wealth of information I’ve been able to learn searching this forum.
Reaching out to you guys because I just can’t seem to make heads or tails of the numbers I’m getting. I’ve been using the Hornady bushing to measure shoulder bump since I started reloading around 2 years ago. Seemed to work alright for me so far. That is until I broke out my Wilson micrometer head yesterday. Initially I just wanted to play with the Wilson gauge (which I forgot I purchased a year ago) and to verify that my shoulder bump was matching what the Hornady bushing was showing. I was resizing 223 and set the RCBS FL sizer to bump the shoulders 0.004”. On each case I checked with the Wilson gauge I was getting 7-8 thousands shoulder bump. Kind of a headscratcher but since I was just loading some plinking 223 with mixed headstamp brass I didn’t give much though to it.
Fast forward to today and I’m sizing my 9x fired Hornady 6.5 Creedmoor brass. My die had been setup to bump the shoulders 0.002” when measuring with the Hornady .400 bushing with no real issue in the past. But when I started sizing today I pulled out the Wilson micrometer head again to see if I could get it to confirm the measurements taken via the bushing. The Wilson gauge was very repeatable, showing 0.006” shoulder bump. I got on the phone with Wilson in the hopes that I may have been missing something obvious and didn’t come up with anything. So, I backed the sizing die out until the Wilson gauge showed I was bumping the shoulder back a very repeatable 2 thousands. These rounds chambered in my rifle just fine. The problem is when I size 0.002” based off the Wilson gauge reading my brass grows by 0.002” from the fired state according to the Hornady bushing. I tried swapping the .400 bushing with the .375 bushing with the same results, I’ve got a good set of Mitutoyo calipers & I’m conscious and try to be consistent on how much pressure I’m putting on the caliper jaws. So I’m left trying to make sense of what’s going on.
Any help will be appreciated!
Reaching out to you guys because I just can’t seem to make heads or tails of the numbers I’m getting. I’ve been using the Hornady bushing to measure shoulder bump since I started reloading around 2 years ago. Seemed to work alright for me so far. That is until I broke out my Wilson micrometer head yesterday. Initially I just wanted to play with the Wilson gauge (which I forgot I purchased a year ago) and to verify that my shoulder bump was matching what the Hornady bushing was showing. I was resizing 223 and set the RCBS FL sizer to bump the shoulders 0.004”. On each case I checked with the Wilson gauge I was getting 7-8 thousands shoulder bump. Kind of a headscratcher but since I was just loading some plinking 223 with mixed headstamp brass I didn’t give much though to it.
Fast forward to today and I’m sizing my 9x fired Hornady 6.5 Creedmoor brass. My die had been setup to bump the shoulders 0.002” when measuring with the Hornady .400 bushing with no real issue in the past. But when I started sizing today I pulled out the Wilson micrometer head again to see if I could get it to confirm the measurements taken via the bushing. The Wilson gauge was very repeatable, showing 0.006” shoulder bump. I got on the phone with Wilson in the hopes that I may have been missing something obvious and didn’t come up with anything. So, I backed the sizing die out until the Wilson gauge showed I was bumping the shoulder back a very repeatable 2 thousands. These rounds chambered in my rifle just fine. The problem is when I size 0.002” based off the Wilson gauge reading my brass grows by 0.002” from the fired state according to the Hornady bushing. I tried swapping the .400 bushing with the .375 bushing with the same results, I’ve got a good set of Mitutoyo calipers & I’m conscious and try to be consistent on how much pressure I’m putting on the caliper jaws. So I’m left trying to make sense of what’s going on.
Any help will be appreciated!