I'd start at 24 and work up but I imagine you'll end up closer to 25. If your going to jam 'em start at 23 and work up to be safe. I haven't shot the 77 scenars so hopefully someone else will chime in. I have only shot the 77 sierras. 2700 will be easy to achieve and I'd think you could manage 2800 fairly easy as well.
thanksfor the info,that gets me in the range i needed to know, i'm loading at magazime length in my t3 tactical, anyone out there shot the 77 gr scenars?