I have built several full custom 257WBY's, and am having another re barrelled now, but used a completely different blueprint than you are suggesting so will only say, great choice on caliber! You will like it a lot.

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About 2016 team "R" candidates "We definitely need a crew with a sack of balls the size of hot water bottles, bloviated estrogen leaking feel-gooders need not apply." Gunner 500