rifles I just state the calibre and firearm type, ie .357/38 rifle or .22lr rifle
however my personal experiences with pistols and revolvers is that they put them on the FAC exactly how you ask, I have .44 muzzle loading revolver slot, and cant get a pistol with that.
working the other way, I have .22lr long barrel pistol slot, for a buckmark, but couldnt buy a taurus LBR as thats a revolver?? however the buckmark isnt single shot?? this is according to the RFD's that I have spoken with, I wouldnt argue as to be perfectly honest, if I was selling a firearm I wouldnt transfer unless the wording was exactly right either.
Don't worry it only seems kinky the first time