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Badger - have you tried one of the moly preps? MsMoly and Hoppe's moly bullet sprays might aleviate the leading.
Apparently, the Gualandi slugs are not only very soft, but gas blowby will cause soughing off of lead ahead of the slug's travel onto the bore and the slug and wads then iron it onto the bore when they pass over the 'particals' of lead.

Spraying the slugs with one of those moly's might work - or they could be tumbled with moly powder as sold for that purpose.

Of course, personally, I prefer RB's - but - I do have some Lyman sabot slugs at 506gr. (WW metal) that fit normal red WWAA field 1 1/4oz. shotcups for testing & I do have some IMR4227 for loading high vel loads, along with Herco, 4756 and 7625 - + some others for standard 1,500fps loads.
Testing as noted on Ed Huble's thread on 12gauge FH showed the lyman's doing very well accuracy wise from 1,500fps to very much higher speeds.

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Hi Daryl

I've tried pretty much all the usual coatings and lubes along with one or two experimental offerings such as PTFE spray from the workshops where I work with very little success. I believe the problem is due to the design of the slug itself.

The Gualandi is probably one of the best slugs I've play with to date exepting only the Brenneke but unlike other offerings which tend to have rifling running lengthways or are undersized and have plain sides (usually used with a plastic wad) The Gualandi has a rather unique form consisting of what I would describe as sealing rings running horizontal to it's axis not un-like a plastic trap wad. Connecting these is a thinly profiled form of rifling but with only two projections (I really should sus out posting pictures)

The wad attached to the Gualandi slug is an extremly good quality wad with excellent gas sealing properties but as you say gas blow-by as well as friction is going to work on the soft lead in this case soft thin lead rings and plaster the lead onto the bore.

Gualandi make a sabot slug which is almost identical to the DGS in all but colour and size. This 12 gauge slug is actually a 20 slug attached to an identical wad inside what could be described as a trap wad. This little beast is suitable for smoothbores as well as rifled bores and Gualandi say it will pass through a choke bore.

I have used these sabot type slugs in smoothebores and with rifled chokes and they are excellent. These slugs are very easy to load, very accurate, don't lead the bore, and are designied to fit in a 70mm case as standard. From a paper punching point of view they are spot-on, but I believe they may be a little on the light side for larger game species.

Regards
Badger

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