Donno Jim.
I package 250g in a baggie, then wrap in al. foil for my 1" bore (1,400 grain ball) and there's never more than about 20% of the al. foil left - the rest is vapourized (which leaves a nice silvery sheen on the grass in front of the muzzle :shock: ) Whod'a' thunk there'd be nuff heat/pressure to vapourize foil? :mrgreen: