The novelty of this phenomenon has worn off.  Left to right are  Jameson (JBA)  .43 Spanish,  JBA 43 Span, Starline 50 -110 (resized to 43 Peabody fireformed in 44-77) , JBA 44-77, a normal   UMC 44-77.   I lose 2-3 cases per trip to range.  I thought it was only Jameson brass but it is not limited to theirs. 
I'm shooting it in an original rolling block  with 83grains of 2Fg velocity is in the 1330fps range  the cases come apart below the bottle neck (JBA 44-77) and I think they were all annealed before forming.  All but one of the broken bits came out with a cleaning rod.  any ideas?

oneatatime wrote on Sep 12^th, 2024 at 5:30pm:


Yes, looks like what happens with a wet chamber if not dried after pushing a wet patch down the bore.

be careful with compression  keep it to .030 or less  art

Hydrogen embrittlement?

JackHughs

art_ruggiero wrote on Sep 12^th, 2024 at 6:12pm:



No compression, in this case, powder is above the bottle neck, .06 poly wad. 

Did it with compression card wad and a grease wad,too

frnkeore wrote on Sep 13^th, 2024 at 2:20am:


I'm new to black powder, never heard of testing for case strength.  How you you do that?   Always something new....

shooting fixed, btw

KFW wrote on Sep 13^th, 2024 at 8:06am:



Since he’s not sizing the cases, they should headspace on the shoulder OK.  Length measurements should tell if the cases are annealed too soft and are stretching.

CHRIS

I had that with a 71 Mauser. Duplex load, grease lubed bullet. Brass was clean, if not actually new. Broke them down and found them corroded inside, and the powder had to be dug out.

Anyone interested in a 71/84? I'd rate it 'Arsenal new'.

I use a bore pig setup to control fouling after each shot. But I don't use a bore mop to follow the bore pigs as they tend to gather moisture and only get the chamber dry for a few shots before they're saturated. So I use a dry patch in the chamber, and down the bore after each pass with my bore pigs. My bore pigs also aren't soaking wet, just damp. I dip the felts in my mix of NAPA water soluable cutting fluid and water and then put them into plastic cartridge boxes before heading to the range.

I was just a child in the early 60's. This was a fair bit more 'spensive...

There's a Persian 98/2x 8mm that's as nice or better. Ran into the seller at a show, a buddy of his would sort thru them and ship him the nicest one.

That Persian 8mm ... 'yeah, that one was nice. You should have seen the first one he sent, had a stock like a Weatherby... UPS broke it in half, I nearly cried'.

I am ignorant to all things pertaining to black powder and lead bullets but how can a damp chamber cause this to happen.
I suppose it must do as it doesn't happen if the chamber is dry.
A few years ago now I bought a custom made highwall in 7mm/303 imp. The guy I bought it from had also bought it from somebody else and had only put a few rounds through it and used the loads given years ago from a well known writer who I can't now remember his name due no doubt to loosing my marbles with age.
As I never use somebody's else's reloads which he gave me I cleaned the cases up with fine wire wool before pulling the bullets and this is what happened.
I thought perhaps he hadn't washed the cases after sizing and left lube in the cases which caused the corrosion on the brass.
The rifle came with custom made dies which fit the chamber perfectly and thanks again to Bulseytom who with his computer worked out some loads using ADI powder as I couldn't find anything on the internet.