It will be fine with HP. You'll have to probably rechrony of course. Molykote maybe the same as Dow55 but that's not really what you should be using on your bolt orings. It may be ok on the outer drive train orings, but not the inner bolt since it's mean to actually swell orings up. If that happens you may have issues.
ETEK 3LT, with 14" critical .680 barrel and cure 3 + bolt F/S