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20 dasher or 20 br build?

My next project build a 20 dasher or 20 br. Barrel be 1-8 twist just for the beger 55. Use blue box lapua brass, no turn necks. Whats your reamer set up, freebore, neck diameter. Neck bushing size you using. Is one better than the other, I have 3 6mm dashers, use to the fire form setup. Another thing how many rounds do you get on barrel life. Any info would be great. I am set on doing a dasher or br. Also show pics of groups you shoot at 300 yards and beyond.
 
The BR and R-15 will get you 3500-3600fps, not too sure the Dasher is really necessary......BUT i also understand the NEED for a .20 Dasher... 8)


Also...i believe .010 freebore will work with the 55`s and the BR case....
 

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