Crush ribs. I don't get it!

First thing, THANK YOU HARVESTER for the amazing crush rib sabot!
I don't know why, but they've been the most accurate sabot for me, in quite a few rifles, over the years. I've used the 40/45s( wishing for a 357/45) , 44/50s and 45/50s. All gave the best results in the rifles I used them in.
Today takes the cake though. I tried some Hornady .451 200 gr XTP's with 70 grains of Swiss 3f. 5 with regular Harvesters and 5 with crush ribs.
The regulars hit + 2 3/4 at 100 and grouped 5x 4 1/4. 3 of those went into 2 3/16.
The load tension was very light, so I thought these results rather good.
The crush ribs went to the powder with 1 finger! I figured shotgun pattern.
Nope!
Hit + 3 1/4, 5 x 3 1/4 and 3 of those were in 1 1/4!
I don't get why the crush ribs do this. Being a looser load, they shouldn't be the more accurate. Nevertheless they are.
Both groups had 2 flyers. I think because the sabot petals are too long for such a short bullet and it may effect separation.
So. Hail to the Crush Rib!
Btw, the rifle was my 22 inch stainless TC Thunderhawk, with a bead and aperture sight set. Bore diameter .500.

Dad had a Traditions Pursuit that shot better with the Crush Ribs, but all other guns that he and I have shoot better with smooth sabots.

I used to always shoot the T/C 50/44 sabots and a 300 .430 XTP and 90 ffg Goex out of my Thunderhawk and it would do less than an inch at 100 yards scoped.

Now I am strictly smokeless except for the Renegade in my avatar. Almost wish I had that Thunderhawk back except for the cleanup.

My NULA will shoot the Harvester smooth black short with great accuracy and it loads easy. If you think its the petal length just try the long black version. It is possible the ribbed petals bend back faster when the sabot leaves the bore.

I have a 22 inch ThunderHawk. In fact it's the rifle I used in my post. Love it dearly, and her sister, my 24 inch Firehawk.
The clean up doesn't bother me at all. Now the wife... </: