Roll Crimping

[Cory Rams]

Here is my second try with the 4 pin roller...



I made a hull trimmer with a dowel and a utility knife blade so I had a nice even hull to start with.
The first one i forced the shell in when the roller was still cold and I wasn't spinning it fast enough. Just pushed the shell into the roller with my hand. I then tried a few of the uneven cut cases that were hot glued in. They crimped OK and I had a mess of melted hot glue to clean out of the roller.
I will have to trim my cases somewhere between the two lengths i tried next time.

The first case i tried is the one on the left. I bent it over pushing to hard when I didn't heat it up enough. I tried it again after I did a few and got it to crimp down an little more.




So will my groups change after crimping VS just gluing in a shot card with the exact same load? I also compressed my FG black powder pretty hard with the 2 brown federal hulls. How much increase of pressure, if any, will I have with a hard pack? My crimp also looks more quare like the 1 pin BPI roller. Is it my crimper or did I just push to hard when crimping?

[edgarspencer]

Cory, are you using a hand drill or drill press? It's essential that the hull be perfectly square with the crimping tool so that all four rollers contact at the same time. The old time hand rollers held the hull perfectly square to the hull also.
The only way I find consistency is using a hull vise, Drill press, with the quill stop set so that all hulls are rolled to the same depth.

[Cory Rams]

I don’t own a drill press. I used a cordless craftsman drill and held the shell with my other hand. I varied the speed since the only way to regulate the RPMs is with my finger on the trigger. I kept checking the crimp till it looked even to my eyes. I’ll have to start looking for a drill press.