For squirrels and crows and such at 50 yards, consider the Beeman R9 in .20 cal or the Diana 48 in .22 cal. The Beeman, a lower power range magnum, shoots very nicely, is a bit lighter and and easier gun to carry and shoulder quickly. The Diana is a super magnum and more powerful. Both have ambidextrous stocks. Both have excellent triggers. The Diana, being a side lever, can easily be fitted with swivels and a carry sling. The Beeman can be cocked and reloaded more quickly. The Diana can be cocked and reloaded almost silently, though. The Beeman should be about a 13-14 FPE air rifle at the muzzle shooting 14.3 gr pellets around 725 -750 PFS. The Diana is more like 18-20 FPE. Don't know in .22 but in .20, shooting around 850-875 FPS. Macarri makes springs and seals for both, which in the long run, will be a good investment for either. I don't have experience with the Diana 350, but the rifle has a big following and you will often see used 350's available. I believe, however, that the 350 may have a RH Monte Carlo style stock. The R9 has a Chinese clone, the B-26. Mike Melick tunes these and sells them in .177 or .22 for a very reasonable price. These have an almost ambidextrous stock. Best bang for the buck, for your first air rifle, I might suggest you consider a tuned B-26 from Mike in .22 cal and use the money you save for a better scope and mount, then move up to a Diana 48 later. But if you want to go with an ambidextrous, super magnum with good knock down power at 50 yards, short of a PCP, I think the Diana 48 is your air rifle. Like Longislandhunter, I also found one in .20 cal (don't make them any more) and I love it. Flatter shooting than the .22 version and plenty of power.