I have a handi rifle in .223, SN ND248XXX. It is marked SB-2.
I measured the twist with a cleaning rod with a tape flag on it, twice. The measurement gives it a twist of 1:11".
Knowing that the published twists of the .223 handi rifles are 9" and 12", I wonder what I have on my hands. I bought it thinking that it's age would make it a 1-12" to burn up a pile of 45 gr. bullets I happened upon.
Has anyone ever heard of this particular twist?