Just got a 6br and a 6 dasher die and having the same issue with both dies. Essentially I’m getting excessive shoulder bump to the point it mushrooms at the shoulder junction. To get it to work my brass has about this much gap between the shell holder and the die. Also I thought that the taper adapter and the collet would essentially sit flush inside each other, but mine does not and separates from each other when I pull the die apart. Attached pictures of everything just curious if this is normal.
SAC Die-excessive shoulder bump
- Thread starter Painterbolt
- Start date
Why are you running the 0.001 shims between the bushing and tapered adapter? Adding those shims ADDS additional shoulder bump in 0.001 increments. Take all of those out and start over with setting the die up to just touch the shell holder when the press is full up. Then screw die in another 1/8 turn and size a case and measure
With my chamber, SAC die, and standard shell holder, I get about 0.005” bump with BRA. I use the Redding comp shell holders to back that off. Nothing like what you see. Are you sure you have it assembled correctly? Correct die bodies?
I also have a gap on both my dasher and creedmoor SAC dies between the taper adapter and body but I don’t need to back off anywhere near that much to get the correct shoulder bump.
Are you sure you’re torquing the top cap of the die enough? I obviously can’t see inside the die when it’s assembled but the gap is smaller when I take it out later and I assume even smaller when tightened.
Personally I’d reach out to SAC and let them know what’s going on. I’m sure they will help you out.
Are you sure you’re torquing the top cap of the die enough? I obviously can’t see inside the die when it’s assembled but the gap is smaller when I take it out later and I assume even smaller when tightened.
Personally I’d reach out to SAC and let them know what’s going on. I’m sure they will help you out.
6 & 22GT SAC die. Yes the gap to a std rcbs shellholder is normal.
I don't need any shims when setting the die up for 1 caliber. I set the shoulder bump to .0015 on the 22GT via the lock ring on the die. Then when switching to the 6GT bushing I can fine tune shoulder bump with the shims if needed.
In my case both the 22 & 6 chambers were cut by the same smith and have the exact same shoulder dimension.
