What Barrel Length on Your Grendel AR(s)?

[StoneHendge]

55 was looking lonely down there at 26" so included my 6mm. I does just say Grendel after all.

[mdewitt71]

Very very good info....... Came across this thread as you just got me drooling over your 12 inch build.
I think I might need to build me a 10- 12 pistol braced Grendel.

[jnr2233]

Very very good info....... Came across this thread as you just got me drooling over your 12 inch build.
I think I might need to build me a 10- 12 pistol braced Grendel.

[A5BLASTER]

The performance of the 6.5 grendel per the above table is impressive - I’m particularly impressed with the performance at 16 inches, however, I entered similar info into StrelokPro (using the hornady 123 sst from the cartridge database)and it shows the bullet going subsonic at between 850 and 900 yards. Am I doing something wrong?

He is most likely way more above sea level then you are.

Feet above sea level has alot to do with it.

[jnr2233]

[A5BLASTER]

Ok I didn’t think of that - I’ll take a look at that - thanks.

Hey no problem glad I could help.

[grayfox]

His explanation below the graph says he is using standard atmospheric conditions... sea level= 29.53 inHg, 59* F.....

[A5BLASTER]

His explanation below the graph says he is using standard atmospheric conditions... sea level= 29.53 inHg, 59* F.....

Sorry didn't see that.

Just figured it was for the altitude he lives and shoots at.

[jnr2233]

His explanation below the graph says he is using standard atmospheric conditions... sea level= 29.53 inHg, 59* F.....

[jnr2233]

Interesting - I think the chart above might be somewhat optimistic.