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Either one will run fine if you maintain it. Spare parts are more easily available for the Colt.
The 1:7 twist will handle 55 grain loads OK. You may get somewhat better accuracy with heavier bullets but the rifle should still be accurate with 55 grainers. My Colt 6520 with a 1:7 barrel shoots 55 grain ball will easily hold the 10 ring of an SR-1 target at 100 yards.
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