Barth
12-28-2012, 02:37 PM
Range Report AR15.com.
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I got a little higher MV with SSA 5.56MM 70gr. TSX (APR 15 2010 lot) fired out of a Colt LWT 10" 1x7 chrome lined barrel : 3 rounds @15ft. about 70 degrees F at Sea Level made: 2574/2576/2577 FPS. With the Barnes reported threshold of 1800 FPS, the SSA 70gr. TSX loading should expand all the way out to right about 300yds. when fired out of this 10" Colt barrel.
SSA 5.56MM 70gr. TSX fired into plastic bags of water @15ft. from Colt 10" yielded consistent 0.47" to 0.49" expansion with 100% weight retention:
http://i9.photobucket.com/albums/a72/leid/Ammo/SSA556MM70grTSX.jpg
Business end of 70gr. TSX fired into water bags from: (L-R) unfired, 10" Colt @0ft., 10" Colt @0ft. to check consistent expansion, 10" Colt @100yds, 24" 1x9 twist Bushy @100yds. (MV almost 3000 FPS) over-penetrated 2 water bags then recovered from hard earth backstop showing extreme abrasion:
http://i9.photobucket.com/albums/a72/leid/shooting/70grTSX10010010100M24100M.jpg
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I got a little higher MV with SSA 5.56MM 70gr. TSX (APR 15 2010 lot) fired out of a Colt LWT 10" 1x7 chrome lined barrel : 3 rounds @15ft. about 70 degrees F at Sea Level made: 2574/2576/2577 FPS. With the Barnes reported threshold of 1800 FPS, the SSA 70gr. TSX loading should expand all the way out to right about 300yds. when fired out of this 10" Colt barrel.
SSA 5.56MM 70gr. TSX fired into plastic bags of water @15ft. from Colt 10" yielded consistent 0.47" to 0.49" expansion with 100% weight retention:
http://i9.photobucket.com/albums/a72/leid/Ammo/SSA556MM70grTSX.jpg
Business end of 70gr. TSX fired into water bags from: (L-R) unfired, 10" Colt @0ft., 10" Colt @0ft. to check consistent expansion, 10" Colt @100yds, 24" 1x9 twist Bushy @100yds. (MV almost 3000 FPS) over-penetrated 2 water bags then recovered from hard earth backstop showing extreme abrasion:
http://i9.photobucket.com/albums/a72/leid/shooting/70grTSX10010010100M24100M.jpg