500, after four shots you shouldn't have to touch the barrels again for a while, the Buffalo should be down for the count!

Kidding asside, I carry a small glove leather tube that just slips over the barrels, and slides up to the middle of the forend. The soft leather fits in my shirt pocket without bother, and also works while trailing, on the end of the barrels to keep your sweaty hand off the blacking at the muzzle, for the PH carry, in hot weather.