I went shooting today after quite some time of work schedule not allowing it. I had fifty 45-70 shells and twenty five 45-90 shells that had been sitting in my garage for about a year and a half. half of the 45-70 casings were loaded with schutzen and half with goex. the 45-90 casings were loaded with schutzen. I also had twenty five 45-90 casings loaded with goex just last week.I had two 45-90 casings and one 45-70 casing break about half way up there length and lodge in the barrel just in front of the rifling lands.all of the casings that separated were loaded with shutzen and had been sitting around for a year or two.These loads were compressed with a wad and no seated bullet. could the powder have corroded the casings to the point where they were weak enough to break.