Question about 375 GT

Wouldn’t leave a lot of shoulder left, .375 is the datum for a 6gt as shown here, but I suppose neither does a 300bo. Slow thumper.
IMG_3684.jpeg

.375+(.012*2)=0.399 of a reasonable outside neck diameter.
That leaves (.459-.399)/2=.030 of shoulder on each side, which is about twice as much as a black out.
 
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