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Funny that you should mention that, I am in the process right now of trying to work up some 180gr SGK, SST loads for my 1:12, just loaded them, need to get to the range in the next couple days. I am using 4350, 748, and BL-C(2) trying to find something with potential. 1:12s are supposed to be able to stabilize long 180s but this 308 has done the best so far with 150gr Speers.
 

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US Army Snipers use the 175gr SMK in their M24s or they did when I was in anyway. I like heavy for caliber bullets, my 6.5x55 loves 140gr SSTs and I can shoot them on the windiest of days with a .520BC, even at a modest 2700fps they are highly effective at range. I will be thrilled if I can get my 308 to duplicate that with it's similar BC 180gr bullets, no I will never need that much penetration on a deer but I like the extra punch, and there is very little difference in the impact speed between a good 150gr (aprox .430BC) and a 180gr (about .500BC) beyond 300yds
 
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