I recently acquired an 1885 low wall in 32-20.
Slugged the barrel and it mikes .308-309. I have an ideal mold, 3117 that casts about .311. 154 gr. Can I use it as cast or size it?
I also have an unused ideal mould 308156 which I have not cast yet. Everything I read refers to the above as ok for any 30 caliber rifle. Comments.
Thanks.

The 311359 is a gas check and I’m anti gas check.

You can use the 311359 with or without the check for a .32-20 but for something bigger like say a .30-30 you want a check.

The standard bullet for the 32-20 is Lyman 3118. The pattern number "8" shows bullet was created a long time ago. It can be sized down to anything. Through the last 65 years it has been used in all my various 32-20 rifles and revolvers. I have one rifle, a Browning 53 lever action, that prefers the Lyman 311316 which they created for users who planned to use their 32-20s at a higher velocity hence the gas check. The Browning prefers this bullet at standard velocities to the 3118. All gas check bullets can be used without the check. For a new barrel from BRC I ordered a mould from Accurate that casts 125 grains and has a higher BC nose than the 3118. I ordered it in a 2 cavity mould with and without a GC. I'm also using the plain base version in a new linered Ballard in 32 S&W Long. The pointy nose bullets intended for the M1 carbine just don't look right in a 32-20 and, of course, cannot be used in tubular magazines. I also wonder about their stability at distance from slower twist rifling. You should have a look at the Accurate Moulds catalog and know that any design can have the diameter altered to what you would like. I size all my 32 bullets .001 to .002 over groove diameter and cast with 1 to 20 lead.