30 Carbine Case Bulge Near Head

Quote:

Originally Posted by Brian Dick

taper crimp die

Yep, and the same for all straight wall cartridges...

Quote:

Originally Posted by USGI

With your dies, is the benefit of your "procedure" that, as long as the cases are all from the same lot and fired from the same chamber, the rest of the cases won't need checked for length after sizing? I can see where that might work. I just went out to the shop and checked a bunch of "emptys" of various headstamps and fired from two different carbines. I found case lengths to be anywhere from 1.273" to 1.296" - a lot of variation, but when I picked out a few that I know were from the same lot and fired from my own carbine, they were fairly uniform in length. I can see where you might save a lot of effort on the resizing with that method too; those tapered cases can take a lot of force to FL resize. - Bob

Hi Bob

Actually, the reason is that my sizing die is smaller than what would be termed a small base die, it is more like a production die. If I set it so that the shell holder touches the bottom of the die, it will size my previously trimmed brass (all from the same lot) to over 1.290". So, I back off the die as necessary until it sizes the cases to 1.285". Bullet retention is solid with no setback during firing. The side benefit, was that measurement of subsequent sizing's of those same cases after firing showed that they would all size back to between 1.284"-1.287" for at least the next 3 loading's before trimming was necessary. I use the same load all the time, so I don't get many dimensional anomalies.

*Disclaimer to all*

Please understand, I don't advocate anyone follow this procedure, I only explained it because it has cut back on how often I have to trim cases. That is the main benefit. This works for me, but may not work for anyone else. If anyone disagrees with this, then just do it the way that works for YOU. The bottom line, is to know YOUR equipment.

After many delays I finally got to the range today. Everything shot and fed fine without issue, and I found a load that I'm pretty happy with. Overall pretty easy to load for, and while I just got a ton of Armscor to plink with it'll be nice to have a load for matches and in case I start to run short on supplies.

Good to hear, it's not wasted time if everything runs correctly in the end.