Some of those rifled screw-in chokes shoot very well, others not so hot.
Much depends, I assume, on the dimensions of the slug and/or cup wad being shot.
In the tests I've seen on-line, the Lyman "waisted" sabot slug did very well.
The loads I saw were the 525gr. sabot slug, 36gr. Longshot, plastic wad, 1,430fps av.
The 1 ounce Lyman Foster slug was doing about the same speed, with 34gr. Long shot.