Whats your Red Dot Zero? 25-50-100 yrds?

You have to use the proper drag model to get accurate graghs and or results. Molon's results appear to be off of a G5 or G7 drag model BT style bullet. The ealier posted gragh appears to be a G1 graph or flat ended bullet. They have dramically different flight paths.

G5 or G7 is what you will usually use ie. XM193 and similiar

Matt

I'm another vote for the 50 yard zero.

Thanks for the graphs guys. They really put things into perspective!

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Originally Posted by glockshooter

You have to use the proper drag model to get accurate graghs and or results. Molon's results appear to be off of a G5 or G7 drag model BT style bullet. The ealier posted gragh appears to be a G1 graph or flat ended bullet. They have dramically different flight paths.

G5 or G7 is what you will usually use ie. XM193 and similiar

Matt

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Matt was correct, I was using a G1 graph ended bullet (coeff. of 0.272)

Molon can expand on this, as well as glock shooter, but the drag model can depend greatly on the bullet AND barrel its fired out of..so it can get messy it seems.

Gents, the only point that I was trying to make with the graph that I posted was that of placing all three trajectories (25 yard, 50 yard and 100 yard zero) on one graph for easier visual comparison and to point out how impractical a 25 yard zero is for most applications involving the AR-15 platform.

Derek,

Just as a simple friendly suggestion, you might want to reconsider the value that you are using for "sight over bore height" when referencing trajectories for the AR-15 platform.

Cheers,

Molon

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Originally Posted by Molon

Gents, the only point that I was trying to make with the graph that I posted was that of placing all three trajectories (25 yard, 50 yard and 100 yard zero) on one graph for easier visual comparison and to point out how impractical a 25 yard zero is for most applications involving the AR-15 platform.

Derek,

Just as a simple friendly suggestion, you might want to reconsider the value that you are using for "sight over bore height" when referencing trajectories for the AR-15 platform.

Cheers,

Molon

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Molon,
good stuff on the spot check.
double checked my average "height over bore"
it was waaaayyy too low..

adjust my charts..and condensed as well.

Quote:

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Originally Posted by Molon

Gents, the only point that I was trying to make with the graph that I posted was that of placing all three trajectories (25 yard, 50 yard and 100 yard zero) on one graph for easier visual comparison and to point out how impractical a 25 yard zero is for most applications involving the AR-15 platform.

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However, it did also indicate how practical the 50 yard zero is for the AR-15. It appears that with the 50 yard zero, according to your graph, you'll stay within +/- 2 inches from about 5 yards all the way out to 250 yards. That's an excellent battle sight zero. Thanks for confirming what I thought I knew. ;)

Red dot for 50M and scopes at 100M for me.

Cameron

I use the 50 yard zero for my Aimpoint. It makes 0-200 simple, and I can still shoot MOZ at 300 if needs be.

RDSs and Irons, zeroed for 50 yards on my ARs. It provides less guess work along a longer distance. As long as you are cognizant of the bullet drop at various distance, the 100 yard zero is GTG as well. Thanks for the graphs Derek and Molon.

Quote:

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Originally Posted by Derek_Connor

Molon,
good stuff on the spot check.
double checked my average "height over bore"
it was waaaayyy too low..

adjust my charts..and condensed as well.

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http://www.box.net/shared/static/zm1r4ning2.gif