.277 build using the 170gr. Elite Hunter

270 Sherman. 3100fps has been reached with 170gr Bergers, with a longer barrel of course but even at 23" like you want it will still be screaming along.

Howdy I have been thinking about a
7PRC necked down to 277. I think it would make a great 270 pushing the 170.
Have Fun with whatever you decided.
EDIT: I did build a 7RUM necked down to a 277 this past year, it is a screamer but a 22 to 24" build may not be a good idea. Mine has 28" 8twt.
N-570 max load 3434fps.
Retumbo 3393fps.
H-1000 3362fps
4 leaf clover at 200yds 5 shots.

I've got a 270 WSM 7.5 twist 24" using MagPro and 175 Sierra THK. Not a screamer at 3050 but did good on an elk last year along with a few Texas pigs

I run 170 Elite Hunters in my 6.8 Western. 3065 FPS with N570 and 3025 with Retumbo and no pressure signs.

I'm switching to ADG brass as we speak, but don't have finished loads for the 170 yet. Hopefully I can get similar velocities with improved accuracy over the Winchester brass I've been using.

I would love a fast twist 270 Weatherby to sling the 170's, not ideal in a short barrel however. Best of luck, Jason

I'm still loving my 27 Sherman mag.

Bghunter338 said:

I'm still loving my 27 Sherman mag.
View attachment 611267View attachment 611263View attachment 611265View attachment 611266

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Is this a wildcat of the 28 Sherman Mag? I don't see a 270 SM on their website. Definitely a beast

Leaf Litter said:

Is this a wildcat of the 28 Sherman Mag? I don't see a 270 SM on their website. Definitely a beast

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Yes, it's basically the same thing but in 270.

Leaf Litter said:

Is this a wildcat of the 28 Sherman Mag? I don't see a 270 SM on their website. Definitely a beast

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I called Rich to get the reamer and use 28 Sherman mag dies with the proper bushing with rcc brass i was able to get my hands on before they went belly up

Have put together three .270 Sherman's (based off standard .270 win), and all performed about the same. A 25.5" was running the 170 at 2930 with H1000. Same gun runs the 140 Badlands at 3240 fps with N565. More velocity was possible with both, but at the expense of accuracy, so useless velocity. A 19" version runs the 140 Badlands at 3030 with rl26. Never tested it, but the 170 would probably be around 2750-2800 with same powder. Take away 50ish fps for H1000. Figure 30ish fps per inch of barrel length. These are realistic expectations from this cartridge that won't kill brass in 3-4 fireings.

If you want more, the 270 WSM built on a medium length action and throated properly would be great. If you want more than that, the 27 nosler is the easy button without fireforming brass or getting custom dies and better availability. Will be in the same arena as the 27 sherman mag. If you want less than any of these, a 27/284 would be a neat little wildcat with lapua brass available.

As far as the 170's, copy and paste how pretty much any of the other berger's work. They go in a few inches, fragment, and destroy vitals. Don't bet your lunch on an exit, that's not what they were designed to do. Make a good shot, and you won't need an exit. They won't go far. Make a bad shot, and you may or may not have an exit to help with tracking. We have killed pronghorn, mule deer and elk with the 170's from 200 yards to 910. I personally would recommend them for up to mule deer. They killed elk fine with a good shot, but a 30 or 338 cal does it better.

codyadams said:

27/284 would be a neat little wildcat with lapua brass available.

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This is very interesting !!

Bghunter338 said:

This is very interesting !!

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I think it could be a fantastic mule deer cartridge in a medium action. I know the 6.5x284 is ridiculously easy to tune and get stellar accuracy from, so neck it up .007", jump from a 156 to a 170, and a slight change in powder, and I think it would be a winner. Not really doing anything you can't do with a standard .270 win, but still fun.

ElJefe said:

2. wildcat cartridge is not an issue, due to i reload as well

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I have .270 AI pushing the 175 Matrix to 2996 FPS.

If you go this route, spec your own reamers (sizing and chamber) and build your own wildcat, i.e., .277 El Jefe.