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Hi Keith, For an AR-15 with a 16-inch barrel and a 1:8 twist rate, the best ammo for accuracy typically includes 55-grain to 77-grain bullets, with 62-grain being a popular choice for general use. The optimal bullet weight can change depending on the range, as heavier bullets (like 70-77 grains) may perform better at longer distances, while lighter bullets (like 55-62 grains) are often effective at shorter. https://www.budsgunshop.com/product_info.php/products_id/75970/pmc+x-tac+full+metal+jacket+boat+tail+5.56+nato+ammo+55gr+20+round+box , . https://www.budsgunshop.com/product_info.php/products_id/50476/hornady+frontier+boat+tail+hollow+point+match+5.56+nato+ammo+75+gr+20+round+box , . Stay safe & have a great 4th of July weekend! 🇺🇸 🇺🇸 🇺🇸

Hi Keith and welcome This will be the 68gr to 69gr Boat Tail JHP Match rounds, as tested from my 16" Rock River Arms AR: .https://www.budsgunshop.com/product_info.php/products_id/50475/hornady+frontier+boat+tail+hollow+point+5.56+nato+ammo+20+round+box. Cheers, stay safe and enjoy!

for the best accuracy you need to reload and spend a lot of time shooting and analyzing different ammo If you dont reload the rounds James and ed recommended would be a good start but again the only way to get the best accuracy is to shoot lots of different types of ammo as each gun is different

AR-15 with a 16-inch barrel = a 1:8 twist rate, the most accurate ammo includes 55-grain to 77-grain bullets, with 62-grain being a popular choice for general use.

Good evening to you!! The 1:8 twist barrel is the workhorse barrel. It handles anything from 55 grain bullets to 77 grain bullets. 62 grain and 67 grain bullets will stabilize well from this barrel. See below links for some recommendations of shells that should work well. Hope this helps. Have a good rest of your 4th weekend. 🇺🇸🇺🇸 'merica" 🇺🇸🇺🇸 https://www.budsgunshop.com/product_info.php/products_id/50475/hornady+frontier+boat+tail+hollow+point+5.56+nato+ammo+20+round+box https://www.budsgunshop.com/product_info.php/products_id/125281/winchester+full+metal+jacket+greentip+5.56x45mm+nato+ammo+62+gr+150+round+box https://www.budsgunshop.com/product_info.php/products_id/22878/hornady+black+full+metal+jacket+5.56+nato+ammo+20+round+box