Short .308 - Page 1

Precision Rifles » Ammunition and Ballistics

Short .308

Pav56C

Joined Nov 2008
Posts 3941
EE 100% (44)

USA

Posted: 12/1/2023 7:59:44 AM EDT

Hey guys, guess this is the right place for this.
Currently assembling a 10.5" AR10 upper in .308 (it'll be suppressed). Why? I'll let you know when I figure it out.

When it comes to ballistics I know more than most but less than many.

Trying to decide between a magnifier with a red dot or an LVPO.
I figure with an LVPO I cannot use the 5.56/.308 reticle as it'll be significantly slower (I estimate 2200 fps).

So would a .300 BO/7.62x39 reticle be a close(r) match.
I'm not looking for perfection here.

Thanks.

jd2395 Joined Feb 2011 Posts 6348 EE 100% (54) VEN	Posted: 12/1/2023 8:51:49 AM EDT [#1] Calculate your holds first or estimate them. You may find your BDC is only good to 300 or so. Then it makes sense to just use RDS and mag

RDTCU Member Joined Oct 2008 Posts 45953 EE 100% (29) SC, USA	Posted: 12/1/2023 8:52:14 AM EDT [Last Edit: RDTCU] [#2] What is the max range you plan to shoot regularly? Paper, deer, zombies? Sight in ~2" high at 100yd and you'll be minute of heart from 0-250.

spectre3 Joined Jan 2008 Posts 815 EE 100% (16) NC, USA	Posted: 12/1/2023 10:35:46 AM EDT [#3] All of my LPVOs have non-BDC reticles to avoid mismatch issues with different ammo/guns.

bluedog82 Joined Aug 2019 Posts 844 EE 100% (24) MI, USA	Posted: 12/4/2023 7:08:37 PM EDT [#4] Just get an LPVO (or prism) with a mil reticle and you won’t have anything to worry about.

BruceLeroy Joined Jun 2006 Posts 3926 EE 100% (142) TX, USA	Posted: 12/4/2023 8:32:31 PM EDT [#5] Neither option will fill all of your needs. I hate LPVOs but would suggest one here because you will still be able to reach out a bit for hunting/fun.

yamahawarrior89

Member

Joined Nov 2013
Posts 2787
EE 100% (46)

MI, USA

Posted: 2/6/2024 7:28:01 PM EDT

[Last Edit: yamahawarrior89] [#6]

Originally Posted By Pav56C:
Hey guys, guess this is the right place for this.
Currently assembling a 10.5" AR10 upper in .308 (it'll be suppressed). Why? I'll let you know when I figure it out.

When it comes to ballistics I know more than most but less than many.

Trying to decide between a magnifier with a red dot or an LVPO.
I figure with an LVPO I cannot use the 5.56/.308 reticle as it'll be significantly slower (I estimate 2200 fps).

So would a .300 BO/7.62x39 reticle be a close(r) match.
I'm not looking for perfection here.

Thanks.

View Quote

This is a primary arms acss 7.62x39/300 blk reticle using American Eagle 150gr @2200 fps

Attached File

556/308 reticle:

Attached File

RDTCU

Member

Joined Oct 2008
Posts 46071
EE 100% (29)

SC, USA

Posted: 2/7/2024 8:35:33 AM EDT

[#7]

Quote History

Originally Posted By yamahawarrior89:

This is a primary arms acss 7.62x39/300 blk reticle using American Eagle 150gr @2200 fps

https://www.ar15.com/media/mediaFiles/372855/Screenshot_20240206-183226_png-3120491.JPG

556/308 reticle:
https://www.ar15.com/media/mediaFiles/372855/Screenshot_20240206-183320_png-3120490.JPG

View Quote

Zero the second one at 200yd...

sigman68

Joined Sep 2002
Posts 7950
EE 100% (8)

UT, USA

Posted: 2/7/2024 8:56:50 AM EDT

[#8]

Quote History

Originally Posted By bluedog82:
Just get an LPVO (or prism) with a mil reticle and you won’t have anything to worry about.

View Quote

This is the route I would take.

A BDC will only be 100% accurate when the velocity of the ammo, BC, weather, and scope height all line up. Then there is the target distances to deal with. The targets at my range are not placed exactly 100 yards apart, and they won't be in the real world either.

Once you know the actual muzzle velocity of the ammo in your gun, you can create a dope sheet using a simple ballistics calculator. It doesn't matter if the LPVO is in Mils, MOA, or even BDC, the sheet will tell you where to hold.