It seems a given that for the big bore conversions a very large donor gone is necessary.

Does this hold true if you are intending to do a BPE conversion instead of nitro express power levels? Specifically 500BPE or 577.

Thanks!

Edited to add: Specifically, wondering if for a light loaded 577, something like a Stoeger could be used. If that is a big negative, http://www.pioneer-pac.com/shotguns/1.html ?

Thanks again!