The first couple years of .244 Rem production rifles had the slower (1-12) twist. Remington considered the .244 a varmint cartridge, and built their rifles for that.
Competing against the .243 Win,which was being touted as a dual purpose round (varmints & deer) the .244 didn't do so well. Because the slower twist didn't do well with the deer weight bullets.
Remington changed the twist rate after a couple years production, so you can find .244s with the fast twist, but sales were always slow, the .244 had gotten a reputation. That's why Remington renamed it the 6mm.
All the 6mm rifles I know have the faster (1-9 or 1-10) twist, and stabilize both varmint and deer weight bullets.
personally I dislike the 788 series rifles, to me they are ugly, BUT, every one I have ever heard of or used has been a good shooter. The 788s actually embarrassed Remington, because their "budget" rifle generally shot better than their top of the line 700s, out of the box.