Ok, based on your further info the Burris Hd 3-15x44 is a good option for bush and out to that 5-600 yards.
The areas I’d be focussing on is a thorough clean of barrel with something like Boretech Eliminator and probably 2-3 cycles of that allowing for a 20-30min soak time. Then lots of patches and neutralise with Hoppes. Then I’d run JBs bore paste or Autosol thru bbl, then flush out with plenty of Hoppes then dry patches. If you’ve fired it with a dirt plug in muzzle you may have damaged not just the crown but also the last couple of inches. Worth getting a gunsmith to look at it.
Then I’d be replacing the stock either B&C or similar or a carbon fibre job, and bedding it. Pull the Hogue stock off completely and what crap is trapped in bbl channel and around action.
A 20 or 21 bbl 270 will cover all your bases, but get a decent suppressor. The 270 is pretty barkie let alone chopping it shorter. Perhaps a DPT with an extra ss baffle.
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