7mm/08 vs. .270 Winchester - The HuntingPA.com Outdoor Community
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post #1 of 29 (permalink) Old 01-14-2011, 02:31 AM Thread Starter
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7mm/08 vs. .270 Winchester

I have both.

While comparing load data recently I noticed that the 7mm/08 is actually faster with many of the loads listed. Same bullet, same powder. Less powder in 7mm/08, but gives a higher velocity.

I just thought the .270 was more of a "thumper" than the 7 08. Looks like it isn't. Other than a slightly higher ballistic coefficient, I think you would have to really split hairs to make a case that one was better than the other.

Am I missing something? Just goes against what I have always heard.
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post #2 of 29 (permalink) Old 01-14-2011, 09:31 AM
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Re: 7mm/08 vs. .270 Winchester

I have both too and would pick up either to hit the woods.

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post #3 of 29 (permalink) Old 01-14-2011, 09:36 AM
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Re: 7mm/08 vs. .270 Winchester

As a rule; With a case of equal capacity (ie. 243win, 260, 7mm-08) and bullets of equal weight, the larger bore will produce higher velocities.

The larger bore allows more surface area for the expanding gasses to push against the bullet.

The 7mm-08 and .270 are quite close in velocity but the smaller .27 cal bullet will generally have a higher BC which will help it down range.

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post #4 of 29 (permalink) Old 01-14-2011, 02:24 PM
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Re: 7mm/08 vs. .270 Winchester

Two of my favorites...The only reason I can think of choosing a 7mm-08 over a 270 is that the 7mm-08 is available in the wonderful Remington Model 7...My Model 7FS weighs no more than a 22 and is just the thing for carrying around up & down ridges all day long..It is a deer rifle, pure and simple...Anything else in the world, I'll leave to the 270.
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post #5 of 29 (permalink) Old 01-14-2011, 03:08 PM
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Re: 7mm/08 vs. .270 Winchester

What do the 08 vs the 280 look like based on wdchuck the 280 should be faster than 7mm 08 with the same grain bullet.
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post #6 of 29 (permalink) Old 01-14-2011, 04:23 PM
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Re: 7mm/08 vs. .270 Winchester

I always felt the 7-08 was a led sled meaning to slow. I had one many years ago and was not impressed and had it rechambered to a 284 the original case for the 7mm. vel. was so much better and it is almost obsolete now to buy. the 280 with more case cap. with definity out perform the 7-08 vel. wise but i wouldnt care for any 7mm on wd chucks due to recoil whwn you have the 22's and 6mm's. for deer hunting i never owned a 270 but i would take it over the 7-08 due to i have friends using it and done well. im not a 7mm fan but that but thats only my preference.
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post #7 of 29 (permalink) Old 01-14-2011, 07:10 PM
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Re: 7mm/08 vs. .270 Winchester

The .280 Remington and the 7mm-08 are the same bullet diamater .284". The .280's larger case capacity will allow it to acheive a higher velocity (and it does).

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post #8 of 29 (permalink) Old 01-14-2011, 11:14 PM
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Re: 7mm/08 vs. .270 Winchester

I can't explain it, but for some reason, the little 7mm-08 has always produced a large amount of instant slam downs for me on deer....I've never felt wanting for more power.
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post #9 of 29 (permalink) Old 01-15-2011, 01:44 AM
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Re: 7mm/08 vs. .270 Winchester

really, i bought a threaded and chambered hart barrel in late 80's my first build in 7-08 it was uded from a buddy he showed me the chrony paper work is why i went with re chambering it to ths 284. i hunted with it using the 120 sierra and swore it was the most crippling gun besides a 308 i ever had.
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post #10 of 29 (permalink) Old 01-15-2011, 02:04 AM Thread Starter
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Re: 7mm/08 vs. .270 Winchester

Quote:
Originally Posted by wdchuckhuntr
The .280 Remington and the 7mm-08 are the same bullet diamater .284". The .280's larger case capacity will allow it to acheive a higher velocity (and it does).
My speer reloading manual, #11, shows a max load for the .280 using 48.5 grs. of IMR 4064 at 2967 fps. This is with a 130 gr. spitzer.

The same manual shows a max load for the 7mm/08 uring 45 grs. of IMR 4064 at 3052 fps. Same barrel length, action, primers and brass.

With IMR 4895, the 7mm/08 328 fps faster.

With IMR 4350, the .280 is 40 fps faster.

With the 145 gr. and 160 gr. bullet, it shows the 7mm/08 faster in every single instance

The 175 gr. loads give a slight edge the .280 more often than not, but only a slight edge.

It sure seems that the 7mm/08 is every bit the cartridge the .280 and the .270 are. If not, I sure can't figure out why.
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