joe_capp
joe_capp
5 posts
Joined December 2009

.40 S&W Loads on 550B

Re-loaded .40 S&W rounds on my 550B for this first time this week -  175 Gr LSWC, 5.6 Grs #5 Pwdr, OCL 1.115.  I experienced sporadic (1 out 7/8 rounds) chambering in my Glock 23 - round would jam rather than fully loading into the chamber. 

I altered the crimp - this helped - but now I experience the same thing (jamming/not fully chambering) with the last round left in the magazine; I've tested at home just to determine (with 1 round in mag) frequency of this happening with 4 different magazines and it's pretty much every time. 

Any ideas - appreciate the help. 

dillon
Administrator
dillon
2,969 posts
Joined July 2007

RE: .40 S&W Loads on 550B

Are you using the factory barrel in your Glock? If so, the use of lead bullets is not recommended, as leasd can quickly build up in the forcing cone, causing dangerous overpressure. Failure to feed the last round often indicates a different overall length may be necessary. Rounds above it can flex a bit more during feeding, but with the follower pushing directly on that last case, it is denied that maneuverability.
joe_capp
joe_capp
5 posts
Joined December 2009

RE: .40 S&W Loads on 550B

No actually bought a Lone Wolf years ago - but prior to that I'd shoot a max of 100 rounds before I'd do a thorough cleaning to ensure the build-up wasn't excessive.  Kind of a frustrating topic given the different views on the subject - but I just forked out the dough for the Lone Wolf to be safe and I've already paid for it in cost savings of LSWC loads.

I'm still slightly confused on the last round and the follower - which way would you suggest on varying the overall length - shorter or longer. 

dillon
Administrator
dillon
2,969 posts
Joined July 2007

RE: .40 S&W Loads on 550B

Be sure you have a newer style follower, marked #6 or higher. Weak mag springs can cause this as well. Check to see that the extractor is not pushing the round to the left.

On the OAL, you should have about .010" of the bullet shoulder above the case mouth. We do oftern experience feeding problems with the SWC in a Lone Wolf barrel, because of the tighter tolerances and shorter relief cut. Might consider changing to a flat point hardcast bullet.

joe_capp
joe_capp
5 posts
Joined December 2009

RE: .40 S&W Loads on 550B

Appreciate the help - these mags are about 17 years old so I bet I have an old follower - we'll see if that helps.  Thanks for the info. 
wildbill1
wildbill1
1 post
Joined February 2010

RE: .40 S&W Loads on 550B

You may want to slight reform your magazine at the top a little narrower. It doesn't take much. I had the same problem with a SIG and it fixed the problem.