I think most any respectable mid to high end pcp will get you half inch at 50 yards. My favorite has always been the FX Royale. Awesome gun straight out of the box, never had any issues, most consistently accurate gun I've had. I had a RAW once but didn't have such a great experience with it. I seem to be in the minority however as you're going to be pretty hard pressed to find anything negative about them. I will say that even though I couldn't get my particular RAW to get a good group at 50 yards, it had the absolute best trigger I've used. I'm posting some pics of a few guns I've had and their capabilities at 50 yards.
FX Royale, 50 yards. Each hole is a ten round group, each group shot consecutively which means 40 shots in a row under a dime at 50 yards without a single flyer and this was without sorting ammo. The slight shift in POI between groups is a scope adjustment I made while shooting. Pellets were pulled straight from the tin. To be fair the gun does have the occasional flyer but I don't know of any guns that won't.
BSA R10 MKII .22 Great all around gun. It's quite difficult to find a competitor that can list off the specs and features this gun has for the price. It's gorgeous, regulated, quiet, deadly accurate. Groups at 50 yards again.
AA S510 .22. Another really popular gun, used to be a better value in my opinion, it went up in price $200 about a year ago or so but if you can get a deal on a used one they are definitely worth owning. It's highly regarded, also gorgeous, excellent trigger, and quite accurate. It is however, not regulated and I think more people consider this to be a nice, light, really accurate hunting gun more than a bench gun.
RAW HM1000X. I'm a little remiss to post my groups with this gun because I don't think they're typical results from RAW. I'm pretty sure mine had some kind of issue with clipping the shroud that I was never able to figure out. They are very heavy guns, especially after scoping but that's often looked at as a good thing for bench rest I think. Expect to easily be over 10 pounds when done but also expect to be amazed by how awesome the trigger is. Again, best I've ever pulled. Also, the HM1000 in .25 isn't the quietest gun, but there are things that can be done to help that and the other models I think might be quieter. To be fair about these groups, I'm including pics of the burrs I was getting in my shroud on this particular unit and want to restate that I don't believe my results are typical. Most people you talk to with experience will likely tell you they can get clover leaf groups at 50 yards with their RAW.
Anyway, hope this helps and good luck with whatever you choose!
Regards,
Cliff
