I'm currently using 2.60gr of AS30N + 100gr Spartan SWC @ 1.035 ( short I know ) and I had major issues using Win brass but swapped to all new Starline and feeding problems disappeared straight away. The lockup is ok but after about 200+ rounds I can get some issues because the chamber is pretty tight. The loads chrono at between 1030 and 1050 fps, its interesting because below those speeds the groups open up quickly off the sand bag.
My STI has a definitive clunk when it batters which is annoying but has the advantage of letting you know if a round gets stuck and doesn't chamber, the trigger is ok its closer to 3lb than 4lb and practically zero creep ( I made up a trigger stop screw with a rubber insert ). The rear sight is aristocrat but the front is a custom steel block grub screwed onto the barrel, the screws are definitely imperial.