Grendel ballistics

[am4966]

I have googled the info but I want to make sure I'm right. Is the Grendel pretty much the same as the 308 175gr ballistically, from a 24" barrel? I know if you shoot different ammo and barrel lengths Itll change some.

I'm asking this since I have told someone this and I want to be sure, I was correct.

[Savage Shooter]

AM - you didn't pin down quite enough variables to be able to give you a more qualified answer. Are you primarily looking at trajectory and drift when you want to make the comparison of "ballistics"? (I.e., you are not concerned about terminal ballistics with your question. ) Bullet weight and design (especially Ballistic coefficient) of both your undefined 6.5 Grendel load and the 175 gr. 308 come into play in your question, so you need to pin down what you are really seeking for someone to provide a better than "barndoor wide" response.

[am4966]

No, Im needing just the ballistics. Since they don't make BDC Reticles for the Grendel and I believe the .308 175gr BDC will match up with the performance of the Grendel.

[gpsman007]

Stay away from b.d.c reticle and go with one marked in mills

[Savage Shooter]

Ditto what GPSman said. BDC reticles only "approximate" the POI at different ranges for a particular load. The Grendel has such versatility of bullet weights and types and hence velocities, covering a wide range of distances where it is effective, you would really hamper yourself buying and relying on the dots in a BDC reticle. Unless of course you plan on shooting only the one load that might match up to it.

[FW Conch]

Those little circles make me nuts. And they gotta be the size of a trash can lid at 200yds.

JMHO ... Jim :-)

[am4966]

I understand fellas, but look at the vortex PST 1-4 it's not a bdc and it's reticle is small and borderline unuseful. However the question still stands about the 308 and grendel. Lol

I've seen charts on Google to suggest they are almost identical, I just want confirmation.

[cosh]

I took some real world velocity, i.e. 308 Win in 16-inch barrel AR10 and 6.5 grendel 20-inch barrel and put BCs and velocity into shooterscalculator.com. For the loads I compared, Grendel trajectory is closer to the 308 than 223/5.56. Still, you would need to take your setup and put in a ballistics calc to get closer accuracy. I have a Fullfield II for now, maybe mildot would have been better but so far I like the clarity I get for the range I am using the Grendel.

[Hoser1]

am4966, are looking for a scope that you can match to the grendel for long range without having to count turns on your scope? If so look into Hollandguns.com He has a reticle that will shot out to 800yds and beyond, put all your data into the program that he sells and make your dope card and your all set. ANY rifle any load will work with his scopes. I am saving my pennies to get one and try out on my 50bmg.

[JASmith]

You can get some idea of what a mil-dot scope will do for you by using the free sight picture generator at Build Sight Pictures

I also use Strelok on my smartphone, and highly recommend it if you find that the displays on shootersnotes are helpful. My only regret with Strelok is that I am not connected with it!

[LRRPF52]

The 175gr SMK has a BC of .496 between 1800-2800fps.

The .264 123gr A-MAX, Nosler CC, and Sierra Match Kings have a BC of .510, and the 123gr Lapua Scenar is .527.

There are newer .308 bullets with higher BC's like the 155gr SMK and Bergers, 155gr Tipped SMK, 168gr Tipped SMK, and 175gr Tipped SMK that are in the .5's for G1 BC.

Watching them through a spotting scope, the better .308 bullets and the 123gr target bullets from the Grendel fly about the same, but the Grendel shooters are able to see their hits more easily since there is half the recoil. The .308 shooter tends to rely on spotter feedback for impact more, unless shooting with a muzzle brake.

For exterior ballistics, they are pretty close.

[biodsl]

Is the Grendel pretty much the same as the 308 175gr ballistically, from a 24" barrel?

Ballistics AE shows the Hornady 123gr Amax load at 2580 fps and a Federal 175 SMK load at 2600 fps. The app shows the flight paths within .1 mil of each other out to 1000 yards.

What scope are you looking at?

[am4966]

Ballistics AE shows the Hornady 123gr Amax load at 2580 fps and a Federal 175 SMK load at 2600 fps. The app shows the flight paths within .1 mil of each other out to 1000 yards.

What scope are you looking at?

It's not for me but someone did some reading at ballistic charts and thought the 556 w/77gr would be a good match for the Grendel. Having been a fan of the Grendel from day one, it's been said that the Grendel closely follows the 308 flight path. I told this person that. Since they are looking at the Trijicon Vcog optic. I just wanted to make sure I was right.

I'm not sure of there intended use. But I'm gonna ask more info and give my best opinion. I know most people don't like bdc Reticles but, they serve a purpose and if you practice with it you'll get better just like with a non bdc optic.

[Buck2732]

It's not for me but someone did some reading at ballistic charts and thought the 556 w/77gr would be a good match for the Grendel. Having been a fan of the Grendel from day one, it's been said that the Grendel closely follows the 308 flight path. I told this person that. Since they are looking at the Trijicon Vcog optic. I just wanted to make sure I was right.

Thats interesting as I brought a TA01b to use on my castrated AR15 as the .308 ret would follow closely to the 77gr SMKs over 24.1gr of RL15. In practice this has worked very well out to 600y.

I have no idea which load in .308 they have used but it works for me.