Just recieved my 6br on a target action like yours. Almost same bbl but a 28". I put a sightron 10-50x60 on it with an egw one piece 20 moa base. I bought "high" burris signature zee rings and installed them with the 0 inserts. I have about 1/8 on an inch from the bottom of the bell to the barrel. Therefore a 56mm bell like you have a tad more clearance so you wont need extra high rings.
I got a fine cross hair scope and im glad that I did, that 6br shoots groups tighter than ive ever seen, so I'm glad I can aim as precisely as I can. The sightron scopes with high magnification have lots of elevation and windage adjustment for long range shooting.
You said you were wanting a 2 piece base? I prefer 1 piece bases myself. Egw offers 3 grades of 1 piece bases 2 aluminium and a steel, the steel one is over a hundred dollars, witch is the one I bought.
Good Luck.
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