It is a really nice gun both in condition and chambering. I have a NS in 44-40 and there is no problem chambering currently manufactured ammo. However, I load and reload my own cartridges using cast lead .429 bullets and do not see .001 or .002 of an inch to be be an issue. That's less than 1 RCH. The grips have the serial number scratched on the inside of them. Sadly, a previous owner got a little too aggressive on the left side of the barrel when "cleaning" The serial number is 185xx it was mfg 1907.That is a super clean NS 44wcf. Can it chamber new 44wcf ammo? The new ammo has a .428 or .429 bullet and the old ammo is .427 IIRC.