Chamfering concerns on Moon-clip j frame cylinders

[Frstevec]

Greetings,
I am reading Michael Bethencourt's tips for better snub shooting and saw this "removing just a tiny amount of the squared inner edges of the cylinder's charge holes . . . will improve reload times."
I would not hesitate to have this done but mj new 642 Pro series came with cyl machined for moonclip use.

It is ok/useful to slighty chamfer the charge holes already modified for moonclips? Thoughts sugestions?
Thanks, Steve

 

[OKFC05]

Absolutely yes. Just break the edge, don't try to make a funnel

 

[6actual]

Is there a tool for this? Found it brownells

45^0 Cutter & Steel Pilot fits .38/.357 Cylinder : BROWNELLS 45^0 MUZZLE/CYLINDER CHAMFERING CUTTER & STEEL PILOT | Brownells

 

[OKFC05]

Is there a tool for this?

Brownells sells them

 

[Frstevec]

Thanks,
I have a date with a gunsmith to have it done.
Steve