Carlson's 12g Mobil Coyote choke, Mobil Rifled choke

[NickRigby]

Just wondering if anyone had any experience with the Carlson's 12g Mobil Coyote choke and Mobil Rifled choke.
I recently bought both for use in my Templeton T1000 straight pull with Sig Sauer Romeo 5 red dot. I usually stick with the IC choke, which gives good accuracy with slugs, NSI Primitiva give 2" at 50m, and a very acceptable killing pattern with Rio 12 pellet buck at 25 m. I use this mainly for pig control and thought it might be good to get a bit more range and accuracy with these specialty chokes. The promo for the Coyote choke said "tight groups with large shot at 70m". Tested them the other day at 50 m and 40 m using butchers paper with a 6" kill zone circled. Rifled choke opened up to just over 3" at 50 m, 12 pellet buck through the Coyote choke got 1 pellet on the edge of paper. Took it into 40 m and tried with Eley AAA buck, 12 pellets (50%) on paper, 3 in kill zone. A bit disappointed, so put the standard IC back in. Nice 2" group with slugs at 50 m, 11 pellets on paper, 3 in kill zone. Anyone else had experience with these chokes, am I missing something ? Given the need to change chokes between slug and buck with the Carlsons, I've decided that on balance, I'm better off just leaving the IC in. Overall a bit disappointed given the price at around $130 ea