Sorry for dredging up an old thread but it bears mentioning that Dominion 43 Mauser cases are balloon headed and have thin bases. If the case doesnt fail on the first reloading chances are it will by the second or third. I bought a case of '70s vintage ammo a few years back and the first thing I did was pull the head and cross section a case to see if "newer" CIL cases had the same affliction as the firm's older offerings. Not surpisingly it was also balloon headed and thin in the base.