My 625JM came with the JM grip. The original owner of my JM PC627 V-Comp subbed rubber Hogue's for the original JM's it had, so I am looking for a replacement grip... they are just a bit pricey (If any of you folks with a 625JM still have an original grip to get rid of, let me know!).
My favorite 'carry' grip for my 629MG was the Ahrends rounded non-fg cocobolo, a la the 329PD's, I believe, which I picked up at a gun show for $10. Great with Specials and Russians - okay with my 300gr LSWC 875 fps Magnums - downright memorable with UMC 180gr SJHP Magnums - and not in a good way! They were a 'fast grab' - and produced no fidgeting for position, but didn't allow proper finger placement/retention for real target work. The 625JM came with Miculek's grip - an improved version of the aforementioned grips. They are, indeed, a fast grab - and decent for all but long distance target work. They have a home on my 625JM... and they actually help the PC 627.
I like the feel of wood stocks - and the Miculek grips feel 'right' to my medium plus sized hands. I have developed CTS, and really big thumpers aren't the fun they once were (My .454 SRH has been gone for two years now...). With this in mind, my 230gr ball ammo, at 800 fps, and my .45 AR loads up to 255gr LSWC at <900 fps are fine with the JM stock on my 625, and my wimpy .357 Magnum loads of 158gr FP's at 900 fps from the PC 627 are great with that grip, too, although I think the 625JM is tired of sharing. The usual stock on my 627 is an Ahrends cocobolo square-conversion finger-grooved variant, which helps with dedicated target, ie, plinking, work. For a fast grab, whether protection or competition, those Miculek stocks are better.
For real recoil, ie, my 4" & 6" 629, I like the Hogue made-for-S&W .460/.500 Magnum grips, which both of my 629's sport. My .45 Colts, including two 625MG's and a Redhawk, sport wood... but they are used at normal SAAMI levels. Oddly, the JM grip feels a bit weird on the 625MG - but I am accustomed to the squared f-g Ahrends cocobolo's there.
Stainz