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12/8/2018 11:30:03 PM
12/8/2018 2:15:31 AM
11/9/2018 9:21:38 PM
Posted: 9/9/2018 4:20:30 PM EST
I decided to try a variable optic on one of my AR pistols and ordered the Trijicon Accupower 1-4 with the red segmented circle reticle. The reticle is matched to the 55gr XM193 out of a 16" barrel but the gun it will be used on is a Colt 6933 with 11.5" barrel.

I've never really used or paid much attention to BDC stuff, will having a shorter barrel noticeably affect the holdovers? I'm probably losing 400 FPS or so compared to a 16" barrel (just a guess) so I'm thinking the holdovers will probably be useless on this specific gun.
Link Posted: 9/9/2018 5:17:42 PM EST
use standard velocity and trajectory in ballistics program to compare to velocity and trajectory for your length barrel.

Someone made a chart for barrel lengths in gun magazine and I'm sure you can find info with google.

You can download a ballistics program and figure out where the trajectory should be with different rounds in different barrels.
Link Posted: 9/9/2018 5:20:46 PM EST
See what MV others get from their barrels.

Find the subtensions of the reticle.

Plug details into a ballistic calculator and compare.

I estimate 3 MOA more drop and MOA more drift at 600yds.
Link Posted: 9/9/2018 7:14:19 PM EST
I ran a m193 load for 2750 fps on strelok pro. with a 50 yard zero adding 1 MOA in elevation the holdovers with accupower reticle came out to be 315 yards (@3), 389(4), 467 (@5).Theres no way to know for sure until you shoot it yourself or chronograph your m193
Link Posted: 9/9/2018 7:43:41 PM EST
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Originally Posted By Alaskanforfreedom:
I ran a m193 load for 2750 fps on strelok pro. with a 50 yard zero adding 1 MOA in elevation the holdovers with accupower reticle came out to be 315 yards (@3), 389(4), 467 (@5).Theres no way to know for sure until you shoot it yourself or chronograph your m193
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I'll probably just use the holdovers as a reference to get close with whatever I'm shooting. The more I shoot the more muscle memory I'll gain knowing where the hits will be. I typically never shoot M193 simply because M855 and Mk318 Mod 1 are so much cheaper locally, but they're both 62gr obviously.

I may just run a MRO dot on the 6933 and move the Accupower to my 16" 6920 does the road anyway.
Link Posted: 9/9/2018 8:05:47 PM EST
I reran it with m855 at 2600 fps. 50 yard zero with 1.25 MOA elevation added. (I believe accupower has 1/4 MOA clicks) Holdovers are at 313, 390, 476 again out to 500 yard holdover.
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