Who makes a chambering reamer for 577 Snider, and what is the normal rate of twist for the barrel???????

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Try Gunboards lot's of Britts there.

Haven't checked on a reamer. I bought a Snider carbine, so bought the Lee dies, and they work great and are dirt cheap, all things considered.

I originally intended to load and shoot 24 ga with roundballs in the carbine (cut off slightly). Turned out I apparently bought the only Snider left with a perfect chamber. I had to cut the 24 ga cases off to 1-1/2" before they would go in. Ended up buying a few cases. Probably better anyway.

As far as twist, it is deathly slow. Inheretid from the .58 muskets. I was doing a little thinking, and looked at barrels. It is tough to find anything except slow twist musket barrels as a stock item. Would likely have to go to a barrel intended for the Nitro Express to get a faster rate.

Art S, I already have the barrels but am going to have them re=bored and chambered. The barrels are now chambered for 458 RCBS and are double rifle barrels. The barrels were left quite large in diameter so have pleanty of wall thickness to go out to the 577 bore. Clear Water Re-boring can rebore the barrels without seperating them! so I just need to deside what rate of twist to ask for. I will likely have to re-regulate thm but may get lucky!
Thanks again for the reply!

I would go with the same twist used in the 577 NE, unless you are planning on going for a round ball double of some kind.
I am not sure about case construction. I presume the available cases can take high intensity loads, but I am not sure about this. For practice and dummy loads, you could size down some brass shotshells, but be sure and don't load them up. As far as I know, they are baloon head cases.

Kynoch still loads factory ammo for the Snider, and Brass is available as well. It can also be made form 577NE brass by simply shortening and running into a snider die.
I don't need high intencity loads for this rifle, just duplicate origenal balistics. The rifle Im re-boreing is now chambered for 458RCBS and has no problem with the working pressures. The barrels were left very heavy, and so is very barrel heavy, but with a 577 hole all the way down the barrels will make the rifle ballance far better. I have several double rifles for other purposes, so there is no need to push the snider. For anything big and bad, I simply use my 470NE double.
The Snider will simply be a fun gun for hog and deer hunting! It is a side lock exposed hammer rifle!

Here is my 577 double with its twin 12 ga. Have the same serial number and the rifle is engraved #1.

Nice old pair! Congrats