Hello:
I searched as Two Flints suggested and did not see "Coon Creek Old West", but they did appear when searched under their name. Within cartridge boxes is a Blakeslee box. Sit down before looking at the price. I bought one, used as-new, via a SSS member. No comparison to the imported ones. Coon Creek's is museum grade. A friend wanted mine a few years back and won't part with it. Coon Creek might be able to convince their artisan to do a larger one, but cost and delay might be prohibitive. Another aspect is weight. The 56-50 ctg's are heavy at roughly 500 grains each. A 13-tube Blakeslee full of them can equal the weight of a carbine. Smiles.
El Supremo/Kevin Tinny