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Posted: 1/17/2015 9:30:45 AM EST
[Last Edit: 1/17/2015 10:10:23 AM EST by JOHNNY223]
LooKing at the BCM 16" middy BFH KMR and building a similar upper with the Rainier Mountain series equivalent. I'm interested in a build that launches the 50gr TSX and 77gr SMK without grouping like buckshot. Any opinions on the two choices ?

http://www.bravocompanyusa.com/BCM-BFH-16-Mid-Length-KMR-KEYMOD-p/bcm-urg-mid-16-bfh-kmr13.htm

http://www.rainierarms.com/upper-rainier-arms-mountain-upper-receiver

J223....



Link Posted: 1/17/2015 9:58:51 AM EST
I have that exact BCM barrel and I can do sub 2" groups @ 100y with cheap XM193 and I don't consider myself a great shot. I have yet to try some 77gr OTM, but I've been impressed thus far.

I have no experience with Rainier barrels, but they are generally regarded as being good barrels. I don't think you could go wrong with either choice.
Link Posted: 1/17/2015 7:09:29 PM EST
FN builds both blanks. Or at least they build the Mountain, and all conventional wisdom points to them building the BFH but getting somebody to confirm that is next to impossible.
Link Posted: 1/18/2015 12:00:33 AM EST
Originally Posted By JOHNNY223:
LooKing at the BCM 16" middy BFH KMR and building a similar upper with the Rainier Mountain series equivalent. I'm interested in a build that launches the 50gr TSX and 77gr SMK without grouping like buckshot. Any opinions on the two choices ?

http://www.bravocompanyusa.com/BCM-BFH-16-Mid-Length-KMR-KEYMOD-p/bcm-urg-mid-16-bfh-kmr13.htm

http://www.rainierarms.com/upper-rainier-arms-mountain-upper-receiver

J223....



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The TSX bullets are copper, less dense than lead, so they are longer for their weight. Thus the 50 is fine in 1/7.
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