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Small Magazine tip

I have an older SDB.  I keep having problems with the small (blue) magazine tip tearing/ distorting after about 300 rounds.  It happens with CCI 500s and WSPs.  I have tried different tightnesses of the knurled keeper nut, but keep having the same issue.

Any thoughts?

It sounds like the primer cup  and punch may not be fully seated in the primer slide. Using calipers, measure from the underside of the primer slide to the top of the cup. This should measure 1.410", +/- .003". If too tall, use a clamp or vise to reseat, then retighten the set screw.

Dillon was right, I was having the same problem with the large magazine. after adjustment everything was ok. thanks

Dillon,

I've having similar problems tearing up red tips...
Measuring 1.390" from top of primer cup to bottom of slide...

Pls advise...

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