I finally got my RIA Ultra HC 10 mm to the range. I have medium-large(ish) hands, wearing XL gloves in my healthcare job. This pistol is a handful, not so much in terms of recoil, but rather it just fills your hand. Because of the aforementioned stupid tabs on the grips, replacement options are limited.
I ordered a thin set of Browne's grips
and I am very, very impressed for three reasons: First, it wasn't clear to me how to order engraving patterns through the website, so I asked that question through their website on Superbowl Sunday at ~ 8:00 PM Eastern time. I got a response by !0:00 PM Eastern time that same night. IMPRESSIVE. Second, the grips arrived in my mailbox on Thursday afternoon of the same week. Maybe they had a set of cocobolo grips with full checkering for a RIA Ultra HC just lying around, but probably not. IMPRESSIVE. Lastly, these grips are gorgeous! Absolutely beautiful. IMPRESSIVE.
TBH, they are not appreciably thinner than the stock RIA grips but are much, much grippier. I'm not sure you could make grips thin enough on a double stack 10 to not have a pistol that fills your hand. Nature of the beast, I guess...