Duplicate 7-08 in a smaller bore?

[Creedmoor shooter]

The creed or 260 will do it. Most everyone runs 140s in excess of 2800 fps. Load data for the creed is on the weak side. I have a 26in barrel on mine and I can run some velociteis with rl-26 that still make me shake my head as to how that little cartridge can make that kind of velocity.

 

[snox801]

I'm always shocked also. I dropped down to the 124hammers but am always shocked how they do with heavier stuff when comparing.

 

[Creedmoor shooter]

I'm always shocked also. I dropped down to the 124hammers but am always shocked how they do with heavier stuff when comparing.

I've always to see what I could get 120s to.

 

[J E Custom]

When you AI the 260 and the 7/08 you gain 100 to 150 ft/sec velocity without an increase in pressure. Ether cartridge fires the standard cartridge and fire forms at the same time. And once loaded in the AI configuration will bump the velocity or the weight
capabilities. All of my rifles based off the 308 have 20 to 22" barrels and the 260 AI will exceed 3100 with a 130 grain bullet, 3000 with a 140 grain bullet. The 7/08 pushes a 120 between 3000 and 3200 depending on the powder used, the AI version exceeds this by 100+ ft/sec.

These rifles have very little recoil and with a muzzle brake can be used by anyone. with less recoil than 10 ft/lbs recoil.

These are my recommendations for youths or recoil sensitive shooters and those that like to shoot a lot but still want a great hunting round.

IF done right, the AI's can be very efficient and easy to load.

J E CUSTOM

 

[ntsqd]

I thought that seemed awfully slow. I did pick the loads they said were the most accurate, not the fastest. Good to know their data is out to lunch. Won't ref it during load development.

Guess I should have Pac-Nor send me a 6.5 CM Savage barrel to try temporarily in the 6BR since I already have dies for that caliber, just have not yet used them.

One thing that I noticed in the rules is that no brakes are allowed. No idea why.

The more that I learn, the less that I seem to know. The nooks and crannies of knowledge in this hobby are endless.

 

[JASmith]

A .260 or 6.5 Creed does exactly this. A higher BC bullet the same weight at 2850. Less drift, less drop, same recoil, more energy.

Also, I suspect, higher impact velocity because the higher BC allows the 6.5 to overtake the 7 at range. (Someone should verify with ballistics calculator)

 

[25WSM]

6.5 creed all the way. Hard to not like it unless your a hater.
Shep

 

[Randy Tidwell]

Take a hard look at the 25 Souper!

https://www.ballisticstudies.com/Knowledgebase/.25-08+.25+Souper.html

I built one for my hunting partner, it is a tack driver. Built on a Model 70 with a 9 twist Bartlen barrel. We were double checking sight in a couple weeks ago preparing for a Lope hunt, 3280fps.

He only shoots 100 grain Barnes TTSX's, but just like a 308, it is inheritly accurate.

I also have a 257AI that works really well.

 

[rbTanzan]

Some of this will depend on the rifle. For example, the Tikka uses the same receiver for the "3-08" size as well as the "270" size cartridges. Knowing that, my 110-lb. wife went with the 270 over the 6.5CM, even if it was a close call. A 129gnLRX does 3100 +/-25fps with 55.0-55.5gn R16 in a 22.4" barrel. That gives it a 200fps advantage over the CM.

All of the above are pretty good choices, 7-08, 270, 6.5 CM, and 260. The 257Roberts would also make a nice hunting rifle but is probably light for 600yd targets without special loading and bullets. Kimber makes the Hunter in the Bob. If going Tikka, I would stay away from the 3-08 because they use an 11"-twist. 7-08, 270, and 6.5CM can be recommended.

 

[rbTanzan]

Some of this will depend on the rifle. For example, the Tikka uses the same receiver for the "3-08" size as well as the "270" size cartridges. Knowing that, my 110-lb. wife went with the 270 over the 6.5CM, even if it was a close call. A 129gnLRX does 3100 +/-25fps with 55.0-55.5gn R16 in a 22.4" barrel. That gives it a 200fps advantage over the CM.

All of the above are pretty good choices, 7-08, 270, 6.5 CM, and 260. The 257Roberts would also make a nice hunting rifle but is probably light for 600yd targets without special loading and bullets. Kimber makes the Hunter in the Bob. If going Tikka, I would stay away from the 3-08 because they use an 11"-twist. 7-08, 270, and 6.5CM can be recommended.

 

[LVJ76]

I thought that seemed awfully slow. I did pick the loads they said were the most accurate, not the fastest. Good to know their data is out to lunch. Won't ref it during load development.

Guess I should have Pac-Nor send me a 6.5 CM Savage barrel to try temporarily in the 6BR since I already have dies for that caliber, just have not yet used them.

One thing that I noticed in the rules is that no brakes are allowed. No idea why.

The more that I learn, the less that I seem to know. The nooks and crannies of knowledge in this hobby are endless.

Maybe I missed it, but what silhouette are you shooting at or around 600yds? Just curious

 

[ntsqd]

The particular range where the silhouette comps are shot at our club's range goes to 600 yards. I'm unclear on the actual distance to the rams. I would guess 500 meters, but I didn't want to assume anything. This is all new to us. We've attended one event and it looked like something she wanted to try. She has a blast with the small bore silhouettes and makes sure that we have them with us on every outing. I make a point of encouraging anything that she wants to try.

Also, I suspect, higher impact velocity because the higher BC allows the 6.5 to overtake the 7 at range. (Someone should verify with ballistics calculator)

Intuitively I guessed at this. It makes sense that a higher BC bullet launched at roughly the same velocity as a lower BC bullet will retain more energy along it's flight path.

RE: .25 caliber; are there 140's easily available?

 

[cohunt]

maybe you should calculate the energy of the 7-08 at 600 yards-- then you will know what your minimum energy needed would be for the other calibers

just a quick number crunch with 140's at 2850fps from a .284 shows 1400ft lbs--but thats with my weather data input here is CO

 

[rbTanzan]

My data only shows 995ft# remaining at 600yards, for the 140TTSX at 2850.
Call it 1000.
The 270 has 1300 ft# remaining for the 129gnLRX at 3100fps out at 600 yards.
The 6.5CM, shooting a 127gnLRX at 2825fps, would have 1005 ft# remaining at 600 yards, which is also like the 7-08.