Lube and/or clean and lube the cartridge holder, this is the pawl opposite the extractor.
If you remove it be careful, it's a part prone to launching into the realm of never-to-be-found small parts.
Not exactly "one cure for all ills" but a good starting point. I've been twice confronted with the situation. The first time the cartridge holder was pulled and the contours where it meets the cartridge rim very modestly softened with a fine stone. The second time, removed and found the bore the holder, spring and follower were inserted into were packed with residue. These parts are shrouded in the action and blow by tends to accumulate, restricting its movement. If you shoot your 77 a lot, stripping and cleaning the bolt now and then is easy and keeps the rifle happy.
The only other feature contributing to ejection is a sturdy spur integral to the trigger guard and is unlikely to be problematic.
Bolt Shims, Trigger Shims, Trigger Kit, Menck Bolt Tool, Gun Springs for the Ruger M77, 77/17, 77/22 Mark II and Hawkeye Rifle - Reduced Trigger Pull Kit VC77TS
www.triggershims.com
A brass rod can be dropped inside the trigger spring to limit over travel but it's a lot of fiddling for little gain, this I know (grin).
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