You can get a decimal size reamer from MSC supply for about $12.00. The fancy pilot sleeves that come witht he $80+ kits do nothing really, you can take an empty case and cut the head off, then slide this sleeve up onto the reamer flutes and if it's still a tad loose wrap some masking tape until it is a snug fit in the chamber. Put a few drops of oil on the reamer tip and run it through with minimal pressure, I use a cordless drill at slow RPM. You are only cutting a couple thousandths of an inch at most.
Mike C :-)