You could get that with a quality break barrel. An RWS 34 should do it and I think you can still get those for under 300. A cheap PCP like the Diana Stormrider or Benjamin Maximus should do it easily. I've never put my Sheridan 2260 co2 rifle on paper at 50 yards but it will consistently shoot 1" groups at 30 yards and it was only 149.00. Any of them will require testing with various pellets to achieve best accuracy.