All the following were with 576 XT-XP-AT saw, assisted by Dolly PS-6100:
WoodlandPro 30RP ripping chain is full-comp and works well. It's based on semi-chisel chain, so it gives a much better surface finish than full-chisel. Off the reel, it's not sharp enough for my taste, so an up-front filing is in order. I've tried it on 28" bar in Granberg mill on black locust. It cut well, with chips liberally mixed in with dust. Saw fed well into such hard wood.
Under the same conditions, I tried "std" 30SC (semi-chisel) chain and it also gave a nice surface finish and seemed to cut well. Didn't need much improvement off the reel. Then I tried 105 DL 30SC chain on 32" bar in bigger mill on hickory. Worked well, nice surface finish, needed sharpening, to my taste, every other tankful. Next candidate was 30SCS 105 DL chain (semi-chisel full-skip) again in hickory. Definitely my choice. Nice surface finish. Let the saw run "freer", and spit nice chips. Still needed a very light filing every other fillup or so, about :35 runtime.
I really like the idea of not needing special-purpose ripping chain, being able to use chain with cutter geometry suitable for crosscutting too. We'll be doing much more milling in the near future on 27" diam hickory, 30" sugar maple and various black locust. Yeah, some will need trimming a mite to fit nominal 30" Granberg mill. No biggie. Some of the hickory logs were ripped down the middle with Granberg Mini-Mill with Dolmar 6100 running 24" bar and semi-chisel full-skip as above. That combo worked GREAT. Half-slabs of 2" thick green hickory, 7' long from 26" OD are manageable. Mini-mill worked great also for ripping one straight face on log before taking off slabs. Just gotta watch wind direction, with it spitting chips & dust UP in the air. Don't swallow the chips, folks, even if hickory tastes good.