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65G barrel length vs velocity loss? - Printable Version

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65G barrel length vs velocity loss? - sharpshooter33 - 01-19-2019

I'm new on the grendel forum per se. I did a quick look around looking for a sticky on the barrel length vs velocity loss. Didn't see any.
Anybody know or have a link to the 6.5 Grendel barrel length to velocity loss?

Thanks
SS33

65G barrel length vs velocity loss? - A5BLASTER - 01-19-2019

Get the second volume of the grendel handloading manuals there is a very good graph in it to help map out predicted muzzle velocity's.

You can use the very ruff idea of 100 fps for every 4 inches of barrel as well. After chongraphing a 20 inch bolt action, 20 inch ar, 18 inch ar and 16 inch ar. I find the 25 fps to be plus or minus within 10 fps of where the speeds were at with factory ammo.

65G barrel length vs velocity loss? - VASCAR2 - 01-19-2019

[Image: 31349786348_1458572e34_z.jpg]49B5F7E7-B98B-4324-A30A-66BACBA3A740


Here are some realmworld results.


http://www.65grendel.com/forum/showthread.php?17743-12-inch-PSA-6-5G-Upper-results-1st-Range-trip


http://www.65grendel.com/forum/showthread.php?12191-6-5-Grendel-Chronograph-results

65G barrel length vs velocity loss? - sharpshooter33 - 01-19-2019

vascar2,
thanks for the links. the 1st had the exact barrel lengths I was interested in. Looks like between 18" to 12" your looking at 245-219fps loss. roughly 35fps per inch in the 18" to 12" barrel range.
great info and great threads.
Thanks
SS33

65G barrel length vs velocity loss? - sharpshooter33 - 01-19-2019

A5BLASTER Wrote:Get the second volume of the grendel handloading manuals there is a very good graph in it to help map out predicted muzzle velocity's.
Didn't know there was a grendel handloading manual? where can I see or get my hands on one?

65G barrel length vs velocity loss? - Wargrendeleagle - 01-19-2019

sharpshooter33 Wrote:Didn't know there was a grendel handloading manual? where can I see or get my hands on one?

https://www.ar15buildbox.com/shop/65-Grendel-Reloading-HandBooks.htm