CptCrl

I have not experienced any problems with the 80-gr IMR 4831 load without using wads, but "hot" primers such as F-215 (or RWS 6507 if you are using Berdan cases) are "de rigueur". I would advise the use of wads if you went much below 80-gr, or used lighter charges of faster burning powders. In low load density loads, I use open-cell polyurethane wads, which have worked with powders such as with IMR 4350/4064 in .450/.400 x 31/4" NE and .400S.

Altenatively, you could try Kynamco's wads.

BTW - I always fully slug bores to arrive at the minimum bore diameter, since the rifled section just forward of the leade can be more affected by the ravages of erosion/corrosion.