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ligonierbill · February 23, 2024, 08:17 AM

My experience is similar. Main bullet I load for both 16" AR and 24" Remington turn bolt is Sierra's 55 gr HPBT (#1390). Max load of TAC gives me 3,200 in the Remington, same as Sierra measured. That load in the AR yields 2,968. Shoots <1" in both guns by the way.

I don't shoot commercial 5.56 ammo in my Remington, but in the AR:
55 American Eagle 3,077
62 American Eagle 2,894
62 Winchester Valor 2,958

Note that the American Eagle is going 100 fps faster than a max bolt load, and although I don't have a direct comparison for 62 gr, the Winchester is a little hotter still.

February 23, 2024, 08:17 AM	#3
ligonierbill Senior Member Join Date: May 20, 2007 Posts: 2,468	My experience is similar. Main bullet I load for both 16" AR and 24" Remington turn bolt is Sierra's 55 gr HPBT (#1390). Max load of TAC gives me 3,200 in the Remington, same as Sierra measured. That load in the AR yields 2,968. Shoots <1" in both guns by the way. I don't shoot commercial 5.56 ammo in my Remington, but in the AR: 55 American Eagle 3,077 62 American Eagle 2,894 62 Winchester Valor 2,958 Note that the American Eagle is going 100 fps faster than a max bolt load, and although I don't have a direct comparison for 62 gr, the Winchester is a little hotter still.