Interested in people's thoughts on case taper and ease of extraction in the Martini Cadet based conversions?

I've always liked the idea of the .357 Max as the basis for a whole range of Cadet wildcats, and am keen on the idea of a .25/.357 Max... sort of a .256 Win Mag Improved using the increased case capacity. Quality brass (ie not Bertram) is much cheaper and easier to find than .222 Rimmed and a bit more punch in 25 cal... sort of a rimmed 250 Myra or 25 Copperhead.

I know first hand problems with sticky cases in the .222 Rimmed Cadets and I've no intention of going into the field with a cleaning rod to clear the chamber every third shot!

I think the Hornet and derivatives, the .32/20, .25/20 and.218 Bee and the .222 Rimmed fit the action very well, leaving a fairly safe chamber wall to barrel tenon thickness ratio. The .357 Mag has the largest case head size I'd be comfortable rechambering a Cadet action to... I know some people have done .30/30's in a Cadet and other variations on that case...

Even the .25/35 in my mind always looks a bit out of scale with that action (much better in a Martini Enfield), and I don't want to fiddle around with changing the block ramp angle or radius.

Case taper seems to be the issue with the Cadet's fairly marginal extraction... I know some of the old timer cartridges like the .25/35 have a pronounced case taper, just wondering how tapered a .25/357 Max case needs to be?

More taper than a .222 Rimmed seems like a good starting point!
But should it look like a mini .303/25

Cheers

TM