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Rounds do not fit in casing gage

About 30% of the rounds I load fail in a Wilson casing gage.  I am loading 40s&W, Federal and Win cases once fired, Missouri Bullet Co IDP #2 170g.

I have checked the adjustment of resizing die.  a resized case will fit into the casing gage. But the complete round will not.

The completed rounds will all fit in my M&P40 Barrel but will not pass the casing gage.  Am I being to particular?

Does anybody have a fix for this problem.

 

 

Look up buldged 40S&W cases on the internet.  Glock is classic for not supporting the case enough and it slightly buldges near the base.  Are you picking up range brass?  I did not know the M&P40 had this issue, too.

G-Rx and Redding make a Push Thru Sizing Die.  Look them up on the internet to see how they fully resize 40 brass.

My solution is:  Set up a separate toolhead with juse deprime/resize.  Run all the cases through.  Case gauge them.  Set aside the buldged ones.  When I get enough I run them through a push through die. I only reload these cases one more time (IE: Leave them in the recycle bucket at the range).  They might be good for many more reloads, but I get enough I can toss.

Since the resized cases drop into your case gauge, I suspect the problem lies in either of two places:  (1) too much of a case bell at the powder drop die; and/or (2) an incorrectly adjusted crimp die.  In my experience, if there is too much of a case bell, it is very difficult to bring the case back, even with a crimp.

Although the real test lies in whether the rounds will chamber reliably, when I ran into this problem myself, I found the answer to be in the adjustment of those two other dies.

Thanks

Back off the bell die and crimping die failure rate down to 3% of which all fit in barrel.

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