7-08 and 308 velocities

N2TRKYS · Jan 17, 2017

What velocities are y'all getting from these calibers in barrels shorter than 24"?

I'm debating getting a Model Seven with a 20" barrel or building off of a M700 action. I know accuracy is more important than velocity, but I want both.

Please post up your loads and velocities.

Thanks

Doublecluck · Jan 17, 2017

7-08 20"

2780 with 140vlds 2.78, 45.1grs, imr 4451
2760- 2800 with 140 gr accubonds 2.80 45.2 4451

BuzzH · Jan 17, 2017

7-08 20" Remington youth.

120 BT, 46.5 grains H380 2825 fps...very mild starting load.

7-08 23" pacnor Remington action

140 accubond 43.0 grains varget 2930 fps

7-08 24" pacnor Remington action

140 accubond 43.0 grains varget 2850 fps

7mm08mo · Jan 17, 2017

140 Nosler ballistic tip with 41 gr varget. Savage model 11 22 inch barrel. 2780 fps. Very accurate load.

1_pointer · Jan 18, 2017

You nor the critter will notice the difference in bullet velocity from a 4" difference in barrel length. Build/buy what feels/handles well and sally forth.

N2TRKYS · Jan 18, 2017

1_pointer said:
You nor the critter will notice the difference in bullet velocity from a 4" difference in barrel length. Build/buy what feels/handles well and sally forth.

That's the problem. I do notice the difference when developing loads.

What velocities are you getting in your 7-08 and/or 308 with barrels shorter than 24"?

BuzzH · Jan 18, 2017

N2TRKYS said:
That's the problem. I do notice the difference when developing loads.

What velocities are you getting in your 7-08 and/or 308 with barrels shorter than 24"?

If you're going to build...why are you worrying about barrel length?

FWIW, if I were to do it all over again, both of the 7-08's I had built would have 22" barrels, and I wouldn't worry about velocity.

With handloads...you're going to be in that 2800ish velocity range shooting 140's with a 22" barrel. All you need, with room to spare.

If you're really worried about velocity, match the cartridge to what you're trying to get. Its flat dumb to try to make a 7-08 a 7 RM...you aren't getting there, no matter the barrel length.

What is it you're trying to attain velocity wise with the 7-08? You haven't mentioned what bullet, bullet weight, etc. that you plan to shoot.

Washington Hunter · Jan 18, 2017

Go with a 270 Win. With the new Reloader 26 powder, people are getting nearly 3100 fps with 150 grain bullets. 7 mag. velocity out of a standard 270.

1_pointer · Jan 18, 2017

N2TRKYS said:
That's the problem. I do notice the difference when developing loads.

What velocities are you getting in your 7-08 and/or 308 with barrels shorter than 24"?

All things being equal there should be roughly a 100fps difference between a 20" and a 24" barrel. I can probably throw a a bullet faster than that difference...

N2TRKYS · Jan 18, 2017

BuzzH said:
If you're going to build...why are you worrying about barrel length?

FWIW, if I were to do it all over again, both of the 7-08's I had built would have 22" barrels, and I wouldn't worry about velocity.

With handloads...you're going to be in that 2800ish velocity range shooting 140's with a 22" barrel. All you need, with room to spare.

If you're really worried about velocity, match the cartridge to what you're trying to get. Its flat dumb to try to make a 7-08 a 7 RM...you aren't getting there, no matter the barrel length.

What is it you're trying to attain velocity wise with the 7-08? You haven't mentioned what bullet, bullet weight, etc. that you plan to shoot.

I'm trying to decide between buying a Model Seven with a 20" or building something in the 22" range for either caliber.

I'm not interested in obtaining 7 mag velocities with a 7-08. I'm wanting to stay as close to or above the 2800 range with 140 grain Accubonds.

Given these bullets and weights, what barrel length would you recommend?

I'd like to shoot 165 grain Accubonds in a 308 at around 2700 fps.

Or, what would be some realistic velocities that you would expect to see from both calibers in a 20" barrel?

BuzzH · Jan 18, 2017

N2TRKYS said:
I'm trying to decide between buying a Model Seven with a 20" or building something in the 22" range for either caliber.

I'm not interested in obtaining 7 mag velocities with a 7-08. I'm wanting to stay as close to or above the 2800 range with 140 grain Accubonds.

Given these bullets and weights, what barrel length would you recommend?

I'd like to shoot 165 grain Accubonds in a 308 at around 2700 fps.

Or, what would be some realistic velocities that you would expect to see from both calibers in a 20" barrel?

I think you can get to 2800+ with a 22" barrel and 140 accubonds all day long. I think you can get there with a 20" tube as well. But, will it be the load that shoots the best in your rifle?

There is no exact science, and IMO, I'm more than happy to leave a couple hundred FPS on the table for accuracy, all day long. Its nice when you don't have to sacrifice one over the other, and typically, you don't have to.

I'm positive that with our 2 7-08's we could chop them to 22" and get 2800 with a 140 AB...probably over that.

I would highly recommend 22" for a 7-08, no more than that. I think you're getting the best of balance and maximizing the potential of the cartridge. The "gain" in velocity by adding length isn't worth it to me.

huronmtns · Jan 18, 2017

The following loads were shot out of a 22" barrel:

Barnes 140 gr TSX, 46.5 gr Big Game, 2847 FPS
Nosler Partition 140 gr, 46.5 gr H4350, 2704 FPS
Barnes 120 gr TTSX, 47.0 gr Big Game, 2902 FPS
Barnes 120 gr TTSX, 44.0 gr Varget, 3094 FPS

All these loads shoot under 1 MOA in my rifle.

Big Game powder seems to boost velocity by 100 FPS with the 140 gr bullets over H4350 and Varget powders before seeing pressure signs. Varget and the 120 gr bullets work very well together. Caution with this load data, some of these loads are longer than 2.800" and are set up for magazine length for my rifle.

Brendan · Jan 18, 2017

Nosler Trophy Grade, 165 AB out of my Kimber Adirondack 308. 18" Barrel.

Threw away the highest and lowest and left myself with 10 readings.
ES = 91FPS
SD = 25.5 FPS
AVG = 2605 FPS
MEDIAN = 2596 FPS.
(The low was 2554, The high was 2645)

The info on the box has these rated at 2800 fps - obviously out of a much longer barrel.

Chrono was a Shooting Chrony Beta Blue.

Lefty315 · Feb 9, 2017

I'm getting 2860 fps with a 140 Accubond and H4895 from a 22 inch Kimber. IMR 4350 I was a bit shy of 2800 in the same rifle. I settled on 4895 because it gave me the best groupings.

Gunner46 · Feb 10, 2017

I settled in on 42.5gr of Varget with a 140BT/AB. That's getting me 2762fps, out of of a Ruger 77 boat paddle. At 4000' (where I use the rifle) that's giving me 1250 Ft Lbs & 2000fps at 500 yds.

Before I rechambered my 308 to a 338Fed, I got almost the exact same velocity with the same charge of RL15 and a 165BT out of a Ruger RA.

7-08 and 308 velocities

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