OK -
I'm really new to this, and haven't yet managed to get out to a SASS shoot to observe.
So, by SASS rules, I am NOT allowed to use
1) a period reproduction 6- or 10-tube Blakeslee cartridge box (I have a 10-tube one), or
2) the Cav-style box with a wooden insert, or even
3) The square-ish box that came with the rifles that held six cardboard 7-shot containers. This is how the cartridges came from the factory - boxes of 42 in six cardboard 'strips' (at least that's what I remember seeing at Gunshows, and in Marcot's book). I don't have either of these boxes, but I have built several factory-style cardboard ones for when I did reenacting.
I find this really odd. These are all very period, were very available, and pretty safe (esp. the latter two). Just using the rounds straight from the factory box is significantly easier than loose shells. The cardboard is even what they call for in the 1st OH Sharpshooter Manual for the Spencer (c.f. Roy Marcot's book).
I guess I'm disappointed. Any of the three sure would be really stylish, and certainly 100% accurate.
Bead Swinger