So I had clear weather today and was able to get a few firings on some brand new Laupua brass. I ran into this "thing" as I was firing to gauge my chamber size:
Using a Redding body die, I found that I have to run some of the cases through the body die 2-3 times before the shoulder bumps back to where I want it and some don't want to give up the last 0.001". Also, the first pass through the die is quite hard. Not, rip-off-the-head hard… but worse than I've experienced an a long time (30yrs hand loading).
the questions are:
1) is having to run the case through the die 2-3 times normal?
2) should I not expect better than +/- .002 tolerance (shoulder measurement after bumping is all done) in doing this?
Now the data:
1) Savage 6.5-284
2) Brand new Laupua Brass that has been through this sequence:
I'm bumping back to a target of 1.80455 -1.8060. 7/10 measure 1.8050+/- 0.001. The 3 longest Just don't want to come down.. unless perhaps I adjust the die (groan…).
The load was 42gn IMR4350, which is the starting load for Sierra 140gn Gamekings. CCI BR2
Other intel:
0) I'm new to the bump die thing My object is to just get chamber length, and then bump back 1-2 thou. My other rifles, I've always just necked, and then FL when things get tight.
1) The cases go through the die very rough on the first pass, and the hang-up is near the head.
2) After firing, the case just above the groove is 0.5000" precisely, and after sizing it will come down to 0.4990" precisely (measured with mit 0.0005" caliper)
3) Using the comp shell holder set properly, the shoulder will actually grow a lot, If I start with the lease impactive holder (+.010) which doesn't even touch the shoulder
4) After all the firing and sizing, concentricity of the brass is very nice (in my book…) under 0.0005"
5) I finds it odd that for such "little bump, I don't require one of the comp shell holders. Using a Hornady FL die sends the shoulder back to 1.8000!!
6) I bought the bump die used on this site.
I add all this data because someone will surely ask. Ask on if there is more required….
Using a Redding body die, I found that I have to run some of the cases through the body die 2-3 times before the shoulder bumps back to where I want it and some don't want to give up the last 0.001". Also, the first pass through the die is quite hard. Not, rip-off-the-head hard… but worse than I've experienced an a long time (30yrs hand loading).
the questions are:
1) is having to run the case through the die 2-3 times normal?
2) should I not expect better than +/- .002 tolerance (shoulder measurement after bumping is all done) in doing this?
Now the data:
1) Savage 6.5-284
2) Brand new Laupua Brass that has been through this sequence:
- measure shoulder w horn comparitor, 1.7995- 1.8400")
- expand, trim and gentle (3 passes) neck turn
- neck size, seat (wilson)
- shoot, measure shoulder (1.8025-1.8060
- neck size, seat (wilson)
- shoot, measure shoulder (1.8035 - 1.8060
- neck size, seat (wilson)
- shoot, measure shoulder (all 1.8055, with 3 @ 1.8065
I'm bumping back to a target of 1.80455 -1.8060. 7/10 measure 1.8050+/- 0.001. The 3 longest Just don't want to come down.. unless perhaps I adjust the die (groan…).
The load was 42gn IMR4350, which is the starting load for Sierra 140gn Gamekings. CCI BR2
Other intel:
0) I'm new to the bump die thing My object is to just get chamber length, and then bump back 1-2 thou. My other rifles, I've always just necked, and then FL when things get tight.
1) The cases go through the die very rough on the first pass, and the hang-up is near the head.
2) After firing, the case just above the groove is 0.5000" precisely, and after sizing it will come down to 0.4990" precisely (measured with mit 0.0005" caliper)
3) Using the comp shell holder set properly, the shoulder will actually grow a lot, If I start with the lease impactive holder (+.010) which doesn't even touch the shoulder
4) After all the firing and sizing, concentricity of the brass is very nice (in my book…) under 0.0005"
5) I finds it odd that for such "little bump, I don't require one of the comp shell holders. Using a Hornady FL die sends the shoulder back to 1.8000!!
6) I bought the bump die used on this site.
I add all this data because someone will surely ask. Ask on if there is more required….