Well, amazing, almost perfect horizontal regulation with a variety of different slugs, without crossing.

nitro - how deep is the rifling in the screw-in?

The reason I ask, is that the paradox rifling I've seen here on the forum is quite deep - like a true rifled choke .020" deep, maybe .025" deep or more. The pictures also showed ratchet rifling, slanted with the high side to engrave and spin the bullet or ball and having a rapid twist.

The depth and the shape is the big difference between rifled choked sections and the screw-ins. If a screw-in rifled choke works - then GREAT!

I-too thought a hard bullet or ball might overtighten the screw-in choke, but you've tested that- thanks.