I have a lot of surplus 844T but have been hesitant to get into it for lack of data. It seems to be closest to H335 so I used tht data with a 10% reduction. I've worked up to 30.0g and Wow! Using the 180g gas check bullet from the Mihec group buy I've managed a 9 shot group with all holes touching at 50 yards. I had one flyer I called out.
Dunno where velocity is and unsure if I should go any further. Not because of safety concerns either. I could defiantly move up a little more but dang it shoots so good here.
They were sized .311, Hornady checks and Bens Red lube.
Rifle is a Ruger M77mkII
Just though somebody out there might like to know.