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Hey all. I'm about to put together my first AR and I could use some advice. I'm going to use a Fightlite SCR lower and chamber it in 223/556. I have some AR 550 steel targets that I really enjoy using and I shoot them as close as 50 yards with my AK (they are tilted down 20 degrees and I've had no ricochets so far). I'd like to shoot these same targets with the AR but my understanding is that the bullet velocity should be no higher than 2800 fps (at 50 yards) or it will damage the steel. I'm planning to use a 16 inch barrel to keep velocity lower and I probably won't shoot the rifle further than 200 yards anyway.
My questions are: Am I correct that the two most affordable and plentiful bullet weights are 55 grain and 62 grain? Do I need to design the rifle around 62 grain ammo to help keep the velocity below 2800 fps at 50 yards? If so, does that mean I need to have a "fast" twist rate in the barrel? Is there anything else I can do to keep the velocity down? Should I buy a "wylde" barrel so that I can shoot both 2.23 and 5.56?
Thanks for any help, guys. I'll be getting a professional to put the rifle together for me since I don't know what I'm doing.
My questions are: Am I correct that the two most affordable and plentiful bullet weights are 55 grain and 62 grain? Do I need to design the rifle around 62 grain ammo to help keep the velocity below 2800 fps at 50 yards? If so, does that mean I need to have a "fast" twist rate in the barrel? Is there anything else I can do to keep the velocity down? Should I buy a "wylde" barrel so that I can shoot both 2.23 and 5.56?
Thanks for any help, guys. I'll be getting a professional to put the rifle together for me since I don't know what I'm doing.