The JM pro is fine, I'm sure. I'm just not big on guns branded from a person. Even if that person is a pro shooter. I'm weird like that. The A300 was the other gun in the running for me actually. Fine guns from my research, at least they were a few years ago. For a semi auto, I'd stay away from anything under the 930 price point personally, but to each their own. I know guys that swear by the new Stoegers, it's got Benelli guts in it, etc. Meh, if I want that, I'd just save up and get the real thing.
So, actually got off work at normal time for once and I've been working on a solution for a more stable indoor shooting bench for the air rifle. I have a nice portable shooting bench, but it's a big and heavy bastard, and I'm not lugging it in and out all the time. So, I went to sLowe's after work and picked up a piece of 1/2" something or other (honestly don't know or care, just looked for the smoothest finish), put that atop a storage container, atop my little work table and ratchet strapped it all together. Once I'm anchored into the gun with my weight on it, it's pretty damned decent I gotta say. Cost me $9, and easy to break down and put away when I'm done shooting.
And of course, had to shoot a few groups to try it out. As usual, 5 in each target.