bajabill, you just remove the ejector/extractor, dip the reamer in a good cutting fluid, stick it in the chamber and give it a few turns until the rim cutter on the reamer just barely touches the existing rim cut in the barrel.
Clean it up and you're done. It's a little more difficult in other calibers because alignment becomes more critical, but for the .45-90 all you're doing is extenting the chamber .3"
are you turning by hand, lathe, drillpress, hand drill?? Or does this depend on the amount of conversion. Also, for the 357 max, what process would you do. Or for a 357 to 35 wheelen, would that require some machine shop equipment?
Turn it by hand for the .45-90 and the Max. For the .357 to 35 Whelan, you should chuck it up in a lathe. The reamers are piloted, but you can "egg" the chamber on the bigger conversions if you're not careful.
I use a large tap holder when turning by hand. It helps to place the barrel lug in a protected vise, also.
By the way, the 357 twist is wrong for the Whelan unless you're going to shoot 180's or 200's only.
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