Ben, 

     How long have you had that one?  It sounds an awful lot like one I built back in about 1992 +/-.  If it IS that rifle, it was slightly rough in the bore, but I had the chamber reamed out to .32 H&R Mag and it shot OK, especially with those little jacketed bullets (gasp) designed for handloading M-1 carbines.  It seems like I swapped it off about a year or so later at either one of the Richmond or the Harrisonburg gun shows, but my recollection is not all it should be.  Anyway, the whole project seems like it worked out pretty well at the time and I have gone so far as to repeat it twice since.  BTW, that was an early, squared-off low-wall block, not the later scalloped top.

Froggie

PS  If that block is marked 22 on the side it WAS bushed, I believe.  They only marked the rf blocks in that way.  GF