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270 win vs 280 Rem

 
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Old 04-01-2011, 10:51 PM
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270 win vs 280 Rem

I've never understood this. Why is it that 270 win can out run a 280 rem in same bullet weight and same barrel lengths? Most reloading manuals list the 270 as outstepping the 280 ( with same bullet wt and barrel length ) when the two are compared. I know for technical reasons this is true do to some powders used are more suitable to the round. I've seen powders that are used for the 280, and that just brings out the ( why in the world factor ), no wonder it seems lagging. From what I can tell the 280 has more powder capacity too. They share the same hull diameters but the 280 has a longer hull (of .051" ) longer than the 270. Do they load the 280 more conservatively or what? Maybe you haven't noticed, I'm a 280 fan. Wondering if someone can shed some light on this topic. Thanks
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Old 04-01-2011, 11:40 PM
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Re: 270 win vs 280 Rem

I'm Currently building A 280. From the research I've done, the concensus seems to be that the 280 load data is very conservative due to it being offered in a semi auto version first. (I believe a pump came second) In a bolt gun you can get more aggresive with the charge. Search trebark's posts. He has a screamer for the 168 VLD's. I think I found it while googling "280 load data."
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Old 04-02-2011, 05:51 AM
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Re: 270 win vs 280 Rem

Quote:
Originally Posted by meatyrem View Post
I've never understood this. Why is it that 270 win can out run a 280 rem in same bullet weight and same barrel lengths? Most reloading manuals list the 270 as outstepping the 280 ( with same bullet wt and barrel length ) when the two are compared. I know for technical reasons this is true do to some powders used are more suitable to the round. I've seen powders that are used for the 280, and that just brings out the ( why in the world factor ), no wonder it seems lagging. From what I can tell the 280 has more powder capacity too. They share the same hull diameters but the 280 has a longer hull (of .051" ) longer than the 270. Do they load the 280 more conservatively or what? Maybe you haven't noticed, I'm a 280 fan. Wondering if someone can shed some light on this topic. Thanks
SAAMI spec pressure is higher with the 270 65KPSI vs 60KPSI for the 280. If you look at Nolser manual #6 they use custom barrels. In their data the 280 has 26" barrel and 24" for the 270 and the 280 has alittle better velocity.

I think alot goes back to when the 280 was a wildcat rd 7mm/06 and the 30-06 is 60kPSI they just kept it the same pressure level. Speer had loading data for the 7mm/06 in one of their Wildcat manual that they published back in the 50's. I'm just guessing so I could be wrong on the reason.
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Old 04-02-2011, 08:48 AM
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Re: 270 win vs 280 Rem

I too have that nosler #6 which is the one I favor most. I also have the hodgdon, and the swift manuals too. This is the first time I've seen the 280 outperform the 270, but it's the two inch longer barrel for the 280 is the reason why. Well they are both off of the 30.06 case so why does it list the 270 as higher pressures then. Because they also chamber the 270 in autos and pumps too. Actually, I think I've seen more chambered in the 270 than the 280.
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Old 04-02-2011, 09:02 AM
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Re: 270 win vs 280 Rem

Hmmmm,

My tho'ts are that the only advantage the 270 would have over the 280 for the same bullet weight and design would be a bit better bc.

The base of the 280 is 0.007" larger, which seems a small difference, but is actually quite a difference. With different expansion ratios, etc they are two quite different cartridges.

I've heard that a "well loaded" 280, especially an Ackley version, will rival the 7 mm Rem Mag. Be careful, cautious and conservative though.
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Old 04-02-2011, 10:01 AM
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Re: 270 win vs 280 Rem

In modern chambers the 270 and 280 have a 2.540 max case length, other than neck size they are twins, and the 280 having a larger area for (push) you can use slightly hotter powders than a 270 and with decent cases a 280 can be run as high as about 66.5k psi, so weight for weight, barrel for barrel the 280 will take the lead.
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Old 04-02-2011, 12:33 PM
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Re: 270 win vs 280 Rem

Quote:
Originally Posted by meatyrem View Post
I too have that nosler #6 which is the one I favor most. I also have the hodgdon, and the swift manuals too. This is the first time I've seen the 280 outperform the 270, but it's the two inch longer barrel for the 280 is the reason why. Well they are both off of the 30.06 case so why does it list the 270 as higher pressures then. Because they also chamber the 270 in autos and pumps too. Actually, I think I've seen more chambered in the 270 than the 280.
I really don't think anyone has the answer your looking for and the SAAMI spec on pressure for the 270 was from the 1920 vs the 280 from the late 50's. If you look at Hodgdon data you will see the 280 is loaded to a lower level than the 270 as to loading the 280 hotter???

When I had my 270 build I never looked at another case or caliber or trying to compare this to that. Same thing happened when I had the 270WSM and 280AI build also I have a 270Wby in the works.

Last edited by TOM H; 04-02-2011 at 05:07 PM.
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