When I get a new revo in .357 I take it apart, clean it, and check everything. As a matter of routine, I cut the forcing cone to 5 degrees. An 11 degree cutter probably won't clean up the forcing cone and you will end up with a cone with two champfers: 11 degrees on the outside, and 7 to 8 degrees further in. 5 degrees has worked very well for me. I use the cutters from Brownell's.

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Tom