That is sort of like my old Berry's Bullets 409-gr/.459" FN grease lubed bullets, except mine are plain-base, have no copper-washed/plated base treatment.
Your Ruger No. 1 is .459"-grooved like mine, I reckon. It will shoot those bullets with OK accuracy only if you keep the velocity down to about 1200 fps. Mine key-holed at higher speed too. I used 26.0 grains of AA-5744 for a 7-yard instrumental velocity of 1172 fps and 3 shots into an inch at 50 yards.
Nice plinker, barely supersonic. Accuracy will get worse until keyholing assuredly at 1500 fps instrumental.
Alternatively: Degrease them and powder-coat paint them to make them 0.460". Still not the desirable 0.461" for best accuracy.
Alternatively alternatively: Shoot them in a .45-70 with .457" grooves using smokeless loads. SAAMI spec for .45-70 is 0.456" minimum groove, so you will find them with groove diameters from .456" to .459" and hopefully no greater than that !
Ron aka "Rip" for Riflecrank Internationale Permanente NRA Life Benefactor and Beneficiary .458 Winchester Magnum, Magnanimous in Victory THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
