AR-15 Zeros and Trajectories

[rojocorsa]

Since the 50/200 thing is generally true, (where a rifle zeroed at 50 is more or less on at two hundred yards),

Will my rifle that is exactly dialed in at 200m also be on at 50m?

I know this sounds like a dumb question, but I'd rather ask than not at all.

[Failure2Stop]

Since the 50/200 thing is generally true, (where a rifle zeroed at 50 is more or less on at two hundred yards),

Will my rifle that is exactly dialed in at 200m also be on at 50m?

I know this sounds like a dumb question, but I'd rather ask than not at all.

Yes, and that's a better way to think about the zero.

[rojocorsa]

Yes, and that's a better way to think about the zero.

Good. I have a fixed rear sight and the front post is set for 200m. I don't want to move it around for shorter distances, so I thought I'd ask.

[jemoritz]

This was some great information.

Does anyone have ballistic information for the M855 and M193 (or similar rounds) shot out of a 10.5" to 11.5" barrel? I could not find it in the forum.

Thanks,

jemoritz

[saddlerocker]

Are there any trajectory charts for 7.62x51/308 from 16-20" barrels?

Sorry if I messed them.

[chungdae]

I set my ACOG to 100meter zero, but I have been trying to figure out where to zero my iron sights and RMR.

[AC45ACP]

on my SBR I use the 25 meter to get on paper then push it out to 100yds..

[DiamondD]

I would like to know where to buy this book.

[Amicus]

I would like to know where to buy this book.

I believe the OP supplied the initial draft in page 1 of this thread.

[CD0311]

Has anyone else tried the 255m Zero? I have been using this with my platoon for the last two years or so it has worked great. It's supposed to be +/- 4" from your line of sight out to 300m. I haven't tried it on paper but as soon as I do I'll post pics.

(I think it's 4" trying to remember I'll post the publication on Tuesday when I get to the office)

Edit 8-23-14
Having trouble posting the pic (fix later) but here are the numbers:

Meters. Trajectory " off LOS
0. -2.5
150. +4.45
300. -4.86

With an M4 and NATO green tip ammo

With a 200m zero you are -10" at 300 and with a 300 zero you are +7". The 255 has worked really well.
With a 20" barrel max LOS difference is 3.8"
Anyone else use it?