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French F-Class rifle

That bedding block is main stream in long range BR. Means you can use a heavy barrel and not have the action try and hold it up. Also useful as a way to reduce harmonic variation in a long barrel.
 
Not uncommon. Instead of a 10+ pound barrel hanging on the threads the lightweight receiver hangs on those same threads. Not uncommon to tune barrel harmonics anyways so what's it batter of you're using a barrel block