Realistically 2" is at the outer edge of being acceptable accuracy for hunting up to about 250 metres but a new BAR should do 1" to 1-1/2" with loads that suit it. Definitely try other bullet weights, and stop cleaning it all the time. 50 rounds is way more than any barrel needs to settle down. Every time you clean the rifle it will take 3 or 4 rounds to foul the barrel to a consistent level that gives good accuracy. Only clean your rifle when you have finished using it and intend to put it away. If you can't get better results with other bullet weights then borrow another proven accurate scope to try as a cross-check on your one. Make sure the butt stock has no movement and the fore-end screw is nipped up. If you are shooting off a bench then make sure the fore-end is in your hand and not resting directly on any surface.
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