The .577 Snider is easy to load for if you 'bite the bullet' and obtain or have made a groove-diameter flat-base bullet mold. If you've been visiting the British Military forums, you will quickly learn this fact when you read their archives and resources pages.

Job no.1: slug the bore!

The Snider rifle in my collection is a Mk.III volunteer pattern 3-bander by Barnett of London, and its groove diameter is .598. If the chamber dimensions won't let you seat a groove-diameter bullet, you may need to shorten the case by an eighth-inch and cut a mold for a heeled bullet (like a .22 rimfire) but this is usually unnecessary.

A Snider double rifle with engraving of dogs is not unusual since the cartridge was a small-to-medium bore chambering in its day. Big game rifles were 8-bore (or perhaps 10 or 12-bore) at the time.

It looks like a nice double. You should have a lot of fun getting it to shoot!