Personally, I shoot a few Sniders so have found it useful to own the Lee die set. They also allow you to form your own Snider brass from the raw 24g shells if you don't want to buy preformed ones. And, not surprisingly, fireformed brass from one Snider won't always chamber in another rifle. I've found the 0.60" bullets to be too loose in some fireformed brass and snug enough in others to require a bit of flaring. I've played with using a bit of neck sizing to hold the bullet in place but my best accuracy has been with the bullet held by nothing more than solidified lube. When I use pure beeswax it holds them in fairly well. And on the lube front, be aware that your rifle may or may not shoot well with only soft lube in the grease grooves. Among the group I shoot with, almost everyone dips their bullet nose in a super soft "lube" prior to shooting. Without that your group with .60's may disappoint. Needless to say, this isn't terribly practical for hunting and is totally inaccurate historically.
The most historically accurate Snider cartridges you can build use Lee .575" minies and absolutely require the dies. For someone used to reloading modern cartridges this is a pretty easy way to get started. The bullet is held snugly in place by neck tension and if you use pure beeswax for lube (as with the original Boxer ammo) my results suggest you'll never need to add supplemental lube. I found the bore looked the same after 20 shots as it did after three. With minie bullets the Snider was noted for maintaining accuracy after considerably more than 100 rounds- unusual for BP cartridge rifles at the time. With effort you can get good results from the minies but most gravitate to the .60's almost immediately.
Also note that if you purchase pre-formed brass from X-Ring you will need to find a way to squeeze .575 minies in for fireforming or, perhaps, use round balls after flaring the case a bit. I did all my fireforming with the minies using a full 70 grn load and was able to see results on target with that powder expenditure.
milsurpo
So from experience, can you tell me just how well the bullets hold in the casings with no sizing? how easily can they come free?
And that sounds like a rather expensive practice, I'd need a mold, or at least come across the minies for sale, just to fire form the casings.