Been out of the loop a while, but was curious if the Triple Shock design solved the pressure problem of using X-bullets in a Contender.
Seems the new light versions in .375 would work pretty nice in the .375 JDJ if so.

I tried some of the Barnes Triple-Shock bullets (120-grn) in my 6.5 JDJ and did experience pressure problems. The accuracy was good and I really like the construction of the bullet.

I've used them in my 6.5 x 284 and my 300 WSM with no problems. Works great on big game, from Antelope to Elk.