M&p 40 problems.

gdouthit

Active Member
Jan 16, 2013
719
18
BCS
I'm having this FTF with my reloads
6abapere.jpg


All brass is sized and belled. I'm using 155gr SWC's with 6.8 grains of silhouette. Seated to 1.125.
 

Dawico

Uncoiled
Lifetime Member
Oct 15, 2009
34,264
113
Lampasas, Texas
You aren't crimping enough to remove the bell. You don't need much crimp but you do need to fully remove the bell.
 

gdouthit

Active Member
Jan 16, 2013
719
18
BCS
Crimped down to .419~.420. Still have one hang up every now and then but solved the bulk of it.

Idk why now but iv never had this problem before. Haven't even adjusted the dies in 800 rounds!
 

Dawico

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Oct 15, 2009
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The amount of crimp is determined by the case length. If this is newer brass (shorter) it isn't going into the die far enough to get the bell removed.

I crimp so the case just has a hair of an inward bend to it. This makes sure the shorter brass is getting the bell removed fully and any cases longer are getting a hint of an inward bend.

The term "crimp" really isn't accurate as the round doesn't need it. There should be plenty of neck tension to keep the bullet from moving.
 

rsayloriii

TGT Addict
May 11, 2009
3,325
38
H-Town, TX
Agreed... the belling isn't being fully removed on all cases. I'd also try to limit the belling to the least possible. Shouldn't need much; just enough to get the bullet started without shaving the bullet during seating.

sent from deep space
 

gdouthit

Active Member
Jan 16, 2013
719
18
BCS
Thanks guys. I'll back my expander out and tweak my seating die a little more.

Have y'all tried any ram shot powders? I like silhouette so far. I was going to try TAC in my ar. It seems like ram shot is the only powder that my LGS can keep in stock.
 

Dawico

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Lifetime Member
Oct 15, 2009
34,264
113
Lampasas, Texas
Agreed... the belling isn't being fully removed on all cases. I'd also try to limit the belling to the least possible. Shouldn't need much; just enough to get the bullet started without shaving the bullet during seating.

sent from deep space
Good point. The bell does seem a little excessive. That will shorten the case life.
 

Dawico

Uncoiled
Lifetime Member
Oct 15, 2009
34,264
113
Lampasas, Texas
Thanks guys. I'll back my expander out and tweak my seating die a little more.

Have y'all tried any ram shot powders? I like silhouette so far. I was going to try TAC in my ar. It seems like ram shot is the only powder that my LGS can keep in stock.
I have tried it but see it very seldom. I don't really look for it either though.
 
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