I have been loading 30-30 for my Marlin for a good while and just recently been loading for my Contender Carbine. I have been without a 30-30 for a while and am shooting up some older reloads in the Contender. Some are good and some not so good. I have a favorite load for my Marlin and when I shot them today in the Contender, I was getting split cases.
The box had been loaded since 2011 and like I said, shot good in the Marlin. I'm using 20.0 gr of AA 5744 with a 311041 with GC. The load shot great in the Contender today, but about half the cases came out split.
Is it possible that 5744 when left loaded for long periods of time do this? Or, since I don't really know the history of these cases, (given to me), that they were just on their last legs? Cases were R-P, Winchester, Super X and even a DWM.
Thanks for any insight.