Can it be done for a decent price?What all does it take to do it besides rechambering and bolt face opening?
The barrel length is an issue, with a 22 inch barrel the .300 H&H doesn't signifigantly outperform a .30/06.
with 20% more case capacity, the H&H will most certainly outperfrom the 30-06 with identical barrel length, chamber pressure, and bullet weight.
I suppose you'll argue what defines 'significantly outperform', but 20% case capacity increase as a rule will provide 5% increase in MV.



























