Both of your questions are yes. If you can shoot the rifle beforehand that would be a good thing, also knowing the background of the rifle and person using it prior in competition. A lot of the good shooting rifles are sold to friends. I"m speaking from that 1 percent experience on 3 different occasions. Two of them I got to shoot. My first one was DOA but didn't know it from lack of experience. JMHO
I don't want to discourage you, there are good rifles for sale. If I was going to buy a used rifle today, it would be one that was a proven rifle in competition.
Good Luck.
Regards,
Joe