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Cooper Firearms said:If you were serious about buying one in 45 caliber, we may be able to run one through the custom shop. It would cost more & would require us to source a different barrel but could likely be done. If you decide to look into this, just give me a call at the shop. 406-777-0373
At one time Wilson made .458 1-20 barrels for White IIRC. I believe they still make .458 barrels in 1-14 and 1-22. The newer barrels seem to be more intended for 458SOCOM but a .450x.458 1-22 blank works just fine for ML barrels too. My Pacnor 1-22 .458 is a wonderful shooter.
Considering the close relationship of Cooper and Wilson, i would assume the 100 piece minimum order is not that big of an issue. If it is, Pacnor, Brux, Douglas and now Shilen blanks are readily available in 1-18, 1-20 or 1-22 depending on brand. Brux uses cut rifling so you can basically choose whatever twist you wish but you may be limited to a 6 groove.