One of my guns is a SIG 400 & it's been a very reliable & reasonably accurate gun, though it does not have a free floated barrel.
Mine shoots 55 gr stuff at about 1.25-1.5" with a 6x scope at 100 yds.
Also shoots 69 & 77 gr SMK's about the same out to 300 yards........that the longest range I've shot it at.
The 1-7" twist will usually handle bullets down to 50 gr OK, but will generally be less fussy with the stuff 55 gr & over.
55 gr is the lightest I've used or intend to use, in that gun. If I want to shoot the lighter bullets, I use a different rifle that has a 1-9" twist.
MM
