steve i can find a freezer somewhere to store meat in if i fill mine up.
psyco both are good cartrages but of the two i'd go 45-70 it's been around a long long time and been tested by a lot of old timers who liked it or it wouldn't be around anymore.
If you want to properly preserve velvet antlers, you will have to inject & brush them with formaldehyde or some of the new less toxic chemicals (4 in 1 solution works great as does Knobloch's antler in velvet tan) as its easier to use however, both will work.
First, using rubber gloves take a razor blade and make small incisions at the tips of all points about 1/8". Next hang the antlers upside down, allowing the blood to drain. Starting at the bases inject the solution into the...