With my Traditions Deerhunter (.54 cal sidelock), I shoot it before I leave the field. With my .50 cal Remington 700 MLS, I simply remove the breechplug and, using the ramrod, push the bullet/powder charge out through the breech. Remington supplies a plastic tube that threads into the breech, so you powder will not spill loose powder into the receiver, but if you use pellets, that is not an issue. Of course, remember to remove caps/primers first!

Brian