I have had a project rifle I have been working on for the last few years. It is an ar platform with a 1:7 14.5 barrel that has the flash hider pin welded to make it the legal 16. My goal vision is for a smaller easy to carry rifle that is capable of longer shots but stays small when needed, think awesome truck gun. I guess what I am asking is, is it doable to shoot heavier bullets out to 4/500 with any energy left in them. Right now I am working with some hornady 75 gr hpbt and Varget and cfe 223. Any advice ?
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I'm shooting the 75 gr Hornady BTHP over a max load of Win748. I'm using that because that's what I started with before CFE223 came out. Today, I'd use the CFE223 or 8208XBR. The advantage to the Hornady 75 gr BTHP is that it will stabilize in a 1:9 twist while the Sierra and Nosler require a 1:8" Not an issue for your gun but there are a lot of ARs with 1:9" twists.
For the range you're talking about you need the heavier bullet. The .223 just isn't a long range weapon. If the 75 gr Hornady doesn't shoot well in your gun try the Nosler or the Sierra. But you definitely want the heavier bullet.
LWD -
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Also be aware that the 14.5" barrel with flash hider will probably cost you some velocity over a true 16" barrel. I've not used an AR at the range your talking about but 400-500 yards is likely at or beyond the maximum effective range of your weapon.
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