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My 1898 SxS with "fluid steel" bls. shot very well with .682" 482gr.) round balls supported by the cupped base cut off a WWAA12 white trap wad.
With smokeless powders, I put one of those cut off cups cup-down over the powder, then 1/2" fiber wad + whatever cards were needed to get the proper height for a standard crimp.
With black powder, a full 7 drams (190gr.)2F GOEX. I used one hard card over powder wad, then the cup-up under the ball to centre it, then star crimped. I might have needed 2 card wads over the powder - I don't remember.
I used 4756 and 7625 powders, however Blue Dot, Long Shot and Steel might be even better. Loading data for extrapolation can be found in Lyman's Shotshell loading manual. I suspect loads to about 1,800fps are quite doable. The BP load ran 1,500fps in my 24" tubes (cut off from 29") as-did the smokeless loads.
both shot to the sights (dovetailed into the rib) out to 100 meters.

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Did a lot of testing with different cast and factory slugs with a couple of poor nan's doubles, .682 and .690 round balls worked the best out to 50 yards, I'd sit mine in an AA12 shot cup on top of an over shot card sitting on a fiber wad, then another fibre was and over shot card roll crimped in.

The longer foster style slugs works best for factory slugs followed by a Lyman diablo slug sitting on two over shot cards.

But in the end the round ball loads proved the best to use with the shotgun, although I preferred a coach gun with imp/cyl chokes better then strait cylinder barrels.

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How did you finish the end of the barrels after cutting?

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My recommendation would be for integral base-wad solid slugs, anything from the Brenneke range, or the Rio Bala Blindada (personal favourite).

As mentioned previously a few boars and buffalo have been brought to bag by the Rio base-wad projectile fired from my modified William Griffiths "double-slugger".

But hey, the fun is in trying anything and everything till you get comfortable with a combination that meets your expectations.

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In your article, you mentioned that your double slugger was regulated. Was it regulated by trying different ammo or was it regulated by a gunsmith?

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Regulated specifically for the RC4 Evolution slug, by me.

Bit of a story there, but if you follow the "RC4 Palla" link from that article, you'll get the gist of it.
Only problem was straightening the top rib before relaying it, the trauma had been fairly extreme and the rib ended up both bent and twisted, so it relayed a bit wobbly. Was supposed to be a temporary job pending a replacement top-rib, but as with a lot of my "projects" it just worked, so is yet to be redone!

I should add that my experiences with the RC4 slug made me a little uneasy viewing 260rem's pics of the GB slug in the Beretta Silver Hawk thread. I might respectfully suggest testing them on something akin to hide, flesh and bone before tackling anything that can bite back.

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Marrakai
When the bull drops, the bullshit stops!
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www.marrakai-adventure.com.au

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