Glock G40 chamber support

[Pablo]

Interesting. Frankly, I have been shooting some unpublish-ed/able    HOT batches (I have to get a chronograph!) with Starline and while perhaps brass life might suffer, I have seen zero, and I mean zero visible brass damage, and frankly nothing more than some primer flow that told me to back off. Case swelling is consistent throughout. I agree something might be wrong with that brass or it's seen ammonia or some heat/process it didn't much like.

[tommac919]

I wonder how old / when was the Starline bought??  All my cases are from over 6 months ago. As mentioned bad processing ?

I too use B dot all the time with older book max of  11 gr. BD... with unused Starline brass.

Haven't seen a split case yet and my most common load is 10.4 gr BD / 180 xtreme with cases hitting the 7-8x loadings.

The only cases I have split so far are some nickel plated after 4-5 loads

[The_Shadow]

triggerman10, It seems that the alloy batch or annealing process could be an issue with your batch.  The reason I asked about the powder, is that the faster burning powders can cause splitting, as the pressure tends to snap it, as the case expands to fill the chamber walls.  Blue Dot is not one of the faster powders so that shouldn't be culprit.

Have you tried the loads in a different chamber or only the one chamber?

If you purchased the brass new you might want to contact StarLine and explain the issue you are experiencing.  They may send you some brass as a replacement.

[triggerman10]

It has all been bought within the last year. It splits between the base and the neck,not the neck. About 1/4" crack right in the center. Factory Glock 20 barrel,don't think it happened in the LW barrel.