@csmiffy don't trust the bullet down the bore trick, how it shoots in practice trumps that test, definitely with flat based spitzers, but don't give up on it till you tried lead boolits.
Counterboring a couple inches is better than chopping, gives you a well protected crown and you retain your sight radius.
Here is the link to @Carlsen Highway's Lee Speed:
https://www.nzhuntingandshooting.co....95/index4.html
And the images in that posting:
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