Been working on revolver reload speed recently and chamfering the cylinder was good for about 0.1 sec on the clock.
I'm trying to see if I can get down to a 1.6-1.7 sec consistent revolver reload (Jerry Miculek is a 1.5 ish reload, I think).
With a stock 625 I was at 1.83 sec, chamfering the cylinder got me to 1.72 sec and reducing the retention on the moon clip holder got down to 1.69 sec.
I feel like installing an extended cylinder release will help as well.
When I set out and completed the 50 round FBI semi-auto handgun COF with 50/50 score using a 2" revolver (327PC) I had to chamfer the cylinder and use nickel plated 38 special in order to make the reload par times.