Re: Making your belted Mag handloads fit perfectly
gearfoot .......
It's almost never a good idea to cut material from your die. This is a common mistake that's done to allow your case to go in farther in, but this
causes bigger problems 99% of the time. There are 2 main reasons why handloads don't fit.
1.) The shoulder needs to get bumped back (just -.001")
2.) The case is too wide above the belt.
About 90% of the time, the case is too wide (or bulged) just above the belt. This problem is made much worse by pushing the shoulder back "too far".
Here's why:
When the case is fired, it stretches to fill out the chamber. This stretching is increased when you're pushing the shoulder back too far. That thins and weakens the brass just above the belt, and you'll soon get headspace separations.
The best way to resize is with a FL die, but be sure to only bump the shoulder back -.001" to -.002"
at the most. This is easily done if you can compare your handloads "at the shoulder" to one of your fired cases.
Also keep in mind that the diameter of factory cases (above the belt) starts out at .507" and they will become too tight in most chambers at .513"
Read the first page on my website, and you'll see how shooters are solving this problem.
www.larrywillis.com