I would assume that 9mm would not look so appealing when presented with a 10 round limit. Large rounds I would think would become more popular than normal. Possibly revolvers in large calibers could be more popular as well.
When I moved back to CA, I faced this very dilemma. I sold my Glock 19 and bought an M&P 45. I figured if they were limiting me to 10, I was going to make them count.
I'd still carry my 9mm Shield with the 8 round magazines.
That won't exclude anything I currently carry. I tried the doublestack 9mm by buying my M&P full size, but I have a pair of 10 rders for it if I wanted to shoot it at the range.
1911s - 45, 10mm, 9mm or 22TCM. Sig 938 if I nead easy, comfortable concealment.
I saw this topic on another forum, and they were pondering if a 10 rd limit could make that 45 GAP cartridge a viable choice again? I think it's mostly dead now, but that Glock 37 is limited to 10 rds, has the grip size of a Glock 9/40, 45 ACP ballistics, yada, yada
I'm carrying my Colt Defender in 45ACP for a while (starting today). My Defender has a capacity of 8 rounds unless I use a standard Colt 8 round mag. that sticks out about a 1/4" but gives me 9 total. Looks like this one except it has Laser Grips on it.