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My 300 win mag was 1 in 11" with a chamber that was cut by the same reamer used for the accuracy international rifles.it had no issues stabilising up to 210 gr Sierra match King bullets.
But the 178...

My first long range rifle was a custom 300 win mag. It shot very well and I was happy with it except for the recoil and the amount of powder it burnt.
If I had to do it again and go the magnum way...