6.5x6.8 speeds ?

[varminter .223]

I've been tinkering with heavier longer barreled rifles and getting them to balance better on my tripod for increased accuracy when shooting while standing when night hunting.
I have a sidecharge 24: heavy barrel 6.5x6.8 that shoots 90 TNT and 95 vmax well but it seems they were only in that 2900 fps area.
A 16" 6.8spc will probably do that.
I'm curious if anyone has any input or experience with different powder speeds and barrel lengths in this variant.

 

[GLShooter]

Basically you will find them the same as the Grendel. A bit more can be had because the pressures are a tad higher. It is a convenient way to use the 6.8 case head size.

Greg

 

[varminter .223]

Shooting 30 grains 8208 with 90s and 29 grains with 95s.
I guess looking at grendel data would make sense.

 

[varminter .223]

Looks like I'm about at max speed already.

All factors figured in 70 bts at 3265 are pretty hard to beat.

 

[GLShooter]

My 6.5X6.8 using FEDERAL brass shows about 1 CC more water than my 6.5 Grendel shows using Lapua or Starline. With a bit more capacity and higher pressures you might realize 75-100 fps over the Grendel. Remember though with the heavy bullets you will eat up more case capacity in the 6.8 version depending on the throating. A long magazine is your friend on this one.

Greg

 

[jrnm]

You are about maxed out on velocity, work on an accurate load and call it good.

 

[varminter .223]

My current load is accurate. I just never pushed it.

 

[Boomstick]

I have a 16". Using Starline brass, 85gr Sierra Varmint and 10x, I'm getting about 21815, but it's HARD on the brass, so backed up a bit and getting 2750 with safer pressure. A little lackluster, but this is a sub 250yd gun for my uses.

 

[varminter .223]

Problem is this is a 24" bull barrel. Might as well be and 18" std contour for those speed. Sits on the bench nice though.

 

[Boomstick]

look at ar15performance. I think he still has a few 16" versions if you want something lighter. I think they are pretty cheap too