BP subs works fine. No need for nickel cases as they may crack sooner than later. SG brass cases would work too. Personally, I'll just use regular SG hulls as brass cases when step on will flatten.
Yes, this load works for me for some time now. It patterned well for me and no problem with knockdowns. Load a few and see for yourself. Felt recoil is a lot better than the Winchester LNR AA.
Good advise. If using a petroleum product such as Vaseline, it will quickly deteriorate any rubber gasket quickly, instead use a silicone-base lubricant or like what's mention above (soap like Dawn).