AR Sponsor
Posted: 12/28/2007 6:09:54 AM EDT
|
Hi All, Im a long time AR rifle owner, but am new to these boards. Ive been wanting to get an ACOG for some time now, but am having trouble deciding which would be best for me. I have two AR rifles I like to shoot, one is a 16 inch barrel, the other is a 20 inch, both flattops. The scopes I am looking at are: 1) TA31RCO-A4CP: I like the reticle pattern in this scope the most, and like the fact that the adjuster caps are attached. 2) TA31F My main concern is how well the BDC will perform on the 16 inch barrel, will the difference be that noticable. I generally only shoot out to 300 yards, but probably once or twice a year am given the oppurunity to shoot Jihaddist Groundhogs from a distance of 500-600 yards. Also, since I will not be shooting the same ammo that was used to calibrate the scopes with anyway, is all of this worry pointless ? I do reload, so in theory could load my own bullets that have similar muzzle velocity as the test bullets. |
|
Get the TA31F, it will track the best for what you are trying to do. The reticle on the TA31F was designed by splitting the difference between bullet drop on a 20" barrel and a 14.5" barrel. Almost all other ACOG models are specific to barrel length. Edited to add that you will probably have to rezero each and every time you go from one rifle to another and then back again. |
|
Straight from the Trijicon Website :: F.A.Q.s "Does bullet weight and/or barrel length effect the reticle bullet drop compensator and range finding stadia lines? The real issue is not the bullet weight or barrel length, but muzzle velocity, ballistic coefficient, and the distance from height above bore. The difference in trajectory from bullet to bullet or barrel to barrel is usually less then the MOA thickness of the stadia lines" - TRIJICON Hope this helps. |
|
Well, the way I interpet that statement from the Trijicon website, is that unless you are shooting ammo with the same characteristics (MV and BC) that they used for their calibration, the difference will be marginal at best. What is the MOA thickness of the stadia lines by the way? |
AR Sponsor