If you want a twiddly bit more power then you can fiddle around with a new powder like RL of Vihtavouri or maybe minor case tweak like AI or a bolt stop stretch .
If you want significantly more power then you need a bigger fatter case like the WSM or RemMag. In which case you need a new action and can choose what you like.
I have seen .284 Win done on Remington short actions, but it’s limited as you say.
7-08 AI is said to be a pretty good solution.
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