What barrel length for 2100fps with 123 ELD-M Black

[Bossman]

I'm trying to figure out what 6.5 gendel barrel length I need to get factory Hornady black 123 eld-m ammo moving at 2105-2110 fps (thought the window can be larger 2100-2125).
Hoping this crew has enough empirical evidence to narrow it down. 10.5, 11, longer, shorter? Thanks for any help.

[ricsmall]

https://www.65grendel.com/forum/showthread.php?17226-6-5-Grendel-Barrel-Length-Comparison

[Bossman]

Thanks for the link and I have reviewed that information before. It states 10.5 at 2180 and suggests 123 eld-m would be even faster. Both of those are faster than the speed window I want to stay in. I know barrel brand will play a role so that's why I am asking those with short barrels who use this factory ammo to chime in with more data if possible.

[LRRPF52]

[LRRPF52]

[grayfox]

Why 2100? Why Hornady black?
It will be supersonic, which is the only reason somebody is looking for a specific MV that I would know of.
If you're looking for accuracy, then the MV node will vary depending on the barrel length, as well as a few other variables.
Personally I wouldn't go less than 12" but that's my taste.

Like '52 says, factory-low SD accurate performance, that low, is tough to find.

[Bossman]

The desired muzzle velocity is to align with a bdc scope and the ammo is already used by other grendels. I want the shortest package possible so 8-9 is good. I just need to know if it's 8 or 9 then, or in between.
I understand the limits of factory ammo and realize the entire bell curve will not fit within the target window. I'm ok with that.
Does anyone here have an 8 or 9 inch grendel?
Does anyone know where this data might exist?
Not seeing any of these available makes me wonder if there are reliability issues going this short?

[fabbrisd]

You have the best info from experienced forum member's - sometimes it can be fun to be a first adopter - you might start asking for suggestions on twist for your shorty..

[VASCAR2]

Mark H. from Precision Firearms posted these velocities a few years ago. This might help in your decision.

Precision firearms short barrel velocity.

7.5 Bartlien at 100 Yards. Groups averaged 1.5 Inches 2000 FPS 123 Match King
8.5 Bartlien at 100 Yards. Groups Averaged 1.4 Inches 2100 FPS 123 Match King
10.5 Bartlien at 100 Yards. Groups averaged .9 Inches 2200 FPS 123 Match King
12.5 Lilja Blank Chambered by PF at 100 Yards. Groups .75 2300 FPS 123 Match King
14.5 Lilja Blank Chambered by PF at 100 Yards. Groups .5 2350 FPS 123 Match King
14.5 Krieger at 100 Yards. Groups averaged .38 2375 FPS 123 MatchKing

https://www.65grendel.com/forum/showthread.php?13307-Short-barrels-with-Grendel

[Bossman]

Thanks everyone, I appreciate the information provided. I've been crunching the numbers and decided to try to get one of the 10.5's from the group buy. I can cheat the close marks and hit the points to 500 reasonably well with the 600 BDC mark being the only one off by an unreasonable margin.

[RANGER]

Mark H. from Precision Firearms posted these velocities a few years ago. This might help in your decision.

Precision firearms short barrel velocity.

7.5 Bartlien at 100 Yards. Groups averaged 1.5 Inches 2000 FPS 123 Match King
8.5 Bartlien at 100 Yards. Groups Averaged 1.4 Inches 2100 FPS 123 Match King
10.5 Bartlien at 100 Yards. Groups averaged .9 Inches 2200 FPS 123 Match King
12.5 Lilja Blank Chambered by PF at 100 Yards. Groups .75 2300 FPS 123 Match King
14.5 Lilja Blank Chambered by PF at 100 Yards. Groups .5 2350 FPS 123 Match King
14.5 Krieger at 100 Yards. Groups averaged .38 2375 FPS 123 MatchKing

https://www.65grendel.com/forum/show...s-with-Grendel