First I suggest rethinking so much reloading of the same brass and the "insanely high pressures." Even if that is not the cause of stuck cases, why subject any gun to excess pressures?
Polishing the chambers might be a good idea but removing too much metal could make things worse by allowing the cases to swell further, so go easy.
Then break the bank and buy some new ammo or cases and stick to reasonable (factory level) loads.
Jim
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