Well, it has been an interesting learning experience handloading for the T/C Contender Super 14 .375 Win. I got a while back. This particular barrel seems to only like two loads that I can tell, but man it REALLY likes them.
Unfortunately, the best accuracy so far has come from the Winchester factory 200 gr. FP loads...but at $50 per 20 rounds thats just not an option for me. The factory ammo runs right at
1 1/4" @ 100 yards for 5 shot groups.
My best handload so far is with 35.5 gn. Reloader-7 pushing a Hornady 220 gn. Flat Point, using CCI primers. They come in at
1 3/8" to 1 1/2" @ 100 yards for 5 shot groups.
Reloader-7 is the only powder I have tried so far, but when funds allow i will try some other compeonents as well. But so far, here are my results...all loads have been tried more than once to confirm findings.

Primers: CCI large rifle
Powder: Reloader-7
Bullet: Hornady 220 gn. FP

33 gr. 3-4" vertical strings
33.5 gr. 4-5" vertical strings
34 gr. 10" vertical strings
34.5 gr. 7" vertical strings
35 gr. 3" groups
35.5 gr. 1 3/8-1 1/2" groups
36 gr. 2-2 1/4" groups
36.5 gr. 8" shotgun patterns

If any .375 Win owners out there have any suggestions on other suitable data please feel free to share. I think my next step will be to work in .10 gn. increments from 35 to 36 to see if there may be a magic area on either side of the 35.5 gn. load. If not, the 35.5 gn. load looks to be a mighty fine recipe for this barrel out to 100 yards.