Comments on: GEAR REVIEW: Field Density Altitude Compensator

By: Chris Walley

Chris Walley — Mon, 19 Dec 2011 21:41:47 +0000

Not only is the FDAC a great piece of kit, but the customer serive that comes with the FDAC is far above average.

By: Kevin

Kevin — Mon, 03 Oct 2011 21:49:48 +0000

Mike, I hate to correct you, but as a pilot and rifleman I can tell you that there is nothing more to DA than altitude and temperature. DA is nothing more than the current altitude (or barometric pressure if you are flying an aircraft and get the local BM from ATIS or flight following) corrected for temperature. Those are the only two variables need known to correct for Density Altitude.

By: Actual Military Sniper

Actual Military Sniper — Thu, 07 Jul 2011 00:14:25 +0000

The FDAC works extremely well with the 123gn Lapua Scenar, simply insert the FDAC slide that is 50fps faster than your 123gn Scenar load, you can only do this with the 123gn Scenar upto about 2650 fps, because our fastest slide in the 175 SMK kit is for 2700 fps.

If you ever have a technical question, feel free to contact us at info@actsvirginia.com and we’ll be glad to answer any questions that you have about our product line.

By: Richard Davis

Richard Davis — Tue, 05 Jul 2011 23:45:42 +0000

Will FDAC work w/ a 65. Grendel cartridge…123gr Scenar?

By: Niles Coyote

Niles Coyote — Tue, 24 May 2011 00:37:33 +0000

I used this today with my Remington tactical 308. I am impressed!

My 175smk load is right at 2550 +/- a couple feet per second. I knew the temp was in the 80’s and my range is a few feet short of 1000′. I applied the temp and altitude and came up with a DA of 2000′. Slid the card to +2k and started pulling the trigger. I shot from 500y to 1000y, at this velocity my load was subsonic at 975y. My impacts were a 1/4 minute low at 5&6 hundred, dead nuts on at 7-9 and 1000 was 1/4 minute high. That is much better than my preprinted tables I usually take with me!

This FDAC is awesome product, I am very impressed!

By: Actual Military Sniper

Actual Military Sniper — Mon, 16 May 2011 20:28:24 +0000

Umm…Maybe you should actually do the two years of R&D that we did during the development of the product, or the 20,000 rounds of ammo we fired all around the world, now combine that with a bunch of actual experience working a bolt gun on a two way range. Maybe spend your youth in the infantry, become a Marine Sniper, become the Chief Instructor of USMC Scout Sniper School.

We have over 2,000 FDAC’s in theater right now, we get daily emails from young men that have been entrusted to hit what they shoot at that thank us for a product that works flawlessly for them.

Computers are great, but they often weigh as much as a radio battery that you might need for stuff like, oh I don’t know…a medevac, maybe some close-air support. But I’m not too sure, i’m delusional.

By: mike

mike — Mon, 16 May 2011 00:08:12 +0000

All I’m sayin is that you are building in a lot of errors with this shortcut -that isn’t really.
Anyone who uses their Kestrel knows that pressure, altitude, and especially DA, don’t actually correlate well.
Just take a moment to use it and see for yourself.. There is more to DA and air density than altitude and temp.
And of coarse BDC charts are a joke compared to local ballistic solutions with software.

All this guessing(how many guesses here?), looking up, holding off, and eventually accepting the reduction of capabilities, saves nothing over actual measurement(map,compass,LRF,Kestrel), field calculations(any ballistic calculator), and dialing in(with scope turrets) for better accuracy.

You’re putting yourselves ear deep in tactical delusions here.

By: 427Cobra

427Cobra — Sun, 15 May 2011 17:20:38 +0000

There is a DA chart on the back, all you need to know is what altitude your at and temp is, no Kestrel is needed, but a Kestrel is more accurite, you can also use the FDAC even if your bullets are going faster or slower than the charts provided, I add\subtract 1000 DA for every 25FPS, this seems to work great with my 175smk load going 2750, I sure wish they made DA cards for 139 Scenars and 140 Amax.

By: Niles Coyote

Niles Coyote — Sun, 15 May 2011 07:42:52 +0000

That was used to prove it correct. It’s not needed, just makes it more precise.

Paper maps, Google earth, etc will have altitude available to you if you research the area you will be shooting in first.

A thermometer can be had cheap or guess the temp or look around for a thermometer where you are at. My shooting range has three, my truck has one and I can usually guess within few degrees without one until it’s below 20… It’s just like judging wind speeds, practice makes you more accurate at interpreting the conditions.

By: mike

mike — Sun, 15 May 2011 02:12:49 +0000

The advantage seems supposedly that it doesn’t need batteries..
But you need to measure with a battery powered Kestrel, or guess the parameters,,Right?

What was the advantage again?