Federal American Eagle 50gr stuff is reasonably cheap (my local shop has it at $20/20 or $90/100 so I'm sure you could get a better price buying bulk) and shoots well for most people. Makes cute fluffy bunnies explode.
I haven't tried cheap Russian stuff myself but have one mate who gave up on it after averaging 1-2 misfires per 10 shots. Might have been a bad batch but doesn't inspire confidence.
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