Jim Watson
New member
Or even aperture sights. I have not seen an open sight on an AR except where somebody attaches pistol sights as backup when their scope fogs or their battery goes flat.
NHSHOOTER said:You are so right Art, 1.5 is not 3 is it...
To hit a 7" tall steel gopher at 200 yds with a 223 zeroed at 100, how tough is that?
TJB101 - Time to get a new ballistic calculator. Zeroed at 100 yds with a sight height above the bore centerline of .9" (typical irons height of a bolt gun), you're 2.88" low at 200 yds using your velocities and a 55grn spitzer pointed boat tail bullet. With a sight height of 2.6" (height of an AR sights) and again, sighted in at 100 yds, you're 1.88" low at 200 yds.
Actually, there is. Look at the muzzle and 50 yd readings. Both are zero so either his sights are lined up with the bore axis and the muzzle reading is right while all of the rest are wrong, or the muzzle reading is wrong.Quote:
TJB101 - Time to get a new ballistic calculator. Zeroed at 100 yds with a sight height above the bore centerline of .9" (typical irons height of a bolt gun), you're 2.88" low at 200 yds using your velocities and a 55grn spitzer pointed boat tail bullet. With a sight height of 2.6" (height of an AR sights) and again, sighted in at 100 yds, you're 1.88" low at 200 yds.
Nothing wrong with his calculator, look at it again. He is not zeroed at 100 yards, it is at 50, addressing where the guy at the range said to zero.
He is wrong though when he says "Tad over 1/2 in drop @ 200 yards". That column is not in inches, it is in MOA, so instead of .6" low it is .6 MOA low, or 1.2 inches at 200 yards.
Not perfect, but if you did that you should be able to hit a 7" tall target at 200 yards.
Drop is determined by the grain of the bullet and the powder grain, along with the length of the barrel with the round.