Instead of messing around with plastic bags, tubes or whatever, why not just put the powder in the cases?
Switch to batch loading.
Get a hand primer and some loading blocks. Size and expand the cases then bring them inside to prime and charge with powder. Then make the trip out to the shop.
A lack of planning on your part does not necessarily constitute an emergency on my part.
Last edited by serf 'rett; December 15, 2012 at 08:22 AM.