I've been using a front bag and a flat bean bag for the back. I found this to be fairly good. I use my left hand to squish the back beenbag slightly to hold it's position. I don't directly touch the back stock. Unfortunately someone stole the front bags from the range so I'll be bringing out my Caldwell bench rest front support. When I get the right ammo for it, I'll test out the bipod. That being said the bipod would be good for varminting but I can't see it being great when shooting for groups.
Shoot slow. The rifle doesn't seem to get too hot when doing slow controlled 5 round groups. Waiting for calms between any wind seems to be enough time. I mount my targets sideways and staple the sides down while leaving a bit of a flap. If I don't feel any wind on my face, and the flap on the target isn't moving then I'm 99 percent of the time good for the shot. Sometimes even at 100 yards I'll feel wind on my face but there's nothing down at the target and vice versa. Further than 200 yards and I'd consider setting up wind flags.
After a 5 round group I'd make sure the barrel was cool. But between each shot didn't seem to be necessary. The slow pace of shooting for groups seemed to work out perfect. I fed them using the magazine rather than single shot. Seemed to be ok. However I haven't shot match ammo through mine yet.
Finding the right ammo seems to be the biggest challenge. Just look at the .22 threads and you get a clear idea of how the right round can do magic while the wrong one can be embarrassing.
I'm an amateur at this, but I've had some decent results for a beginner. The above has worked pretty well for me with these types of rifles.
Here's an example of what the wind can do to your round. This was a 5 shot group at 100 yards from my DPMS LR-308 (AR-10) with 167 grain Lapua match ammo (I only had 8 rounds of it, 3 were used for sighting and were touching, I used the remaining 5 for this group). We were getting 10-20 km/h wind gusts. The wind was going mostly downrange with a very tiny bit to the right. When I shot the 4th round the gust just hit. I screwed up my timing. The one round outside the group was actually raised almost half an inch and also a very tiny bit to the right.