Matt - when you consider a lot of NA rifles have excessive neck diameters (planned chambering reamer life expectancy, maybe?) - some upwards of .008", the extra .005" might not be too bad.
With the rifle currently shooting into around an 1-1/4" or less with sized down 225gr. Hornady's, .232gr. Normas, 270speers, 285 Privis and 286gr. Norma, 293gr. TUG's and sized down 300gr. Hornady's, I think this one will probably 'stock'.
Besides, Taylor, a consumate black powder shooter & builder, is not much interested in modern stuff. Afterall, this rifle was made in 1929 and he traded merely for a better guide gun, one with a little more range and power.