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30-06 to 7mm question

Hammer101st

How much performance loss would ther be if i just necked down 30-06 to 7mm? Would it be major or minor? Was just curious because of the 280 being longer to shoulder. How many grains less would ther be
 
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Just make it an improved shoulder to .455" - 30* keeping the base of the neck at standard neckdown location. No loss compared to standard 280. Could be the RCBS 30* version I forget. It would probably take me over an hour to find that Sizing Die lol.
 
RustyPin said:
Just make it an improved shoulder to .455" - 30* keeping the base of the neck at standard neckdown location. No loss compared to standard 280. Could be the RCBS 30* version I forget. It would probably take me over an hour to find that Sizing Die lol.
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Whats the .455 measurement a location? or diameter
 
Hammer101st said:
How much performance loss would ther be if i just necked down 30-06 to 7mm? Would it be major or minor? Was just curious because of the 280 being longer to shoulder. How many grains less would ther be
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A 30-06 to a 280 Remington, assuming equal barrel length, loaded to the same pressure (assume 60,000+PSI), equal weight bullets in the 280 will be a bit slower because of the reduced expansion ratio. The 280 bullets of equal will have higher BC and SD, the 30-06 in generalmwill handle 175 grain and heavier projectiles better than the 280. If I remember correctly SAAMI may list the 280 at lower pressures.

Enough to matter? God that's the argument that has ruined many friendships.

The 7mm-08, 7MM Mauser and the 280 Remington are in my opinion very good cartridges for a 7MM field rifle. In that order from 200 to 400 yards on medium game.

In my opinion if the 06 shoots keep her.
 
I've shot a standard 280 for a lot of years. Alot of deer have not walked away from a well-placed 140 Sierra Gameking. I don't think the deer particularly care that the bullet was .284" instead of .308". I like the 280 Rem, I've only worked up one load with it and it has done very well for whitetail over the years. Longest shot with it was around 350 I think.
 
David Milisock said:
A 30-06 to a 280 Remington, assuming equal barrel length, loaded to the same pressure (assume 60,000+PSI), equal weight bullets in the 280 will be a bit slower because of the reduced expansion ratio. The 280 bullets of equal will have higher BC and SD, the 30-06 in generalmwill handle 175 grain and heavier projectiles better than the 280. If I remember correctly SAAMI may list the 280 at lower pressures.

Enough to matter? God that's the argument that has ruined many friendships.

The 7mm-08, 7MM Mauser and the 280 Remington are in my opinion very good cartridges for a 7MM field rifle. In that order from 200 to 400 yards on medium game.

In my opinion if the 06 shoots keep her.
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I dont have an 06 but i have brass for my 6.5-06AI and i want another straight 280 but the only 280 brass i can find is nosler and i will pass on that. So i figured if necked down 06 brass got me close i can use pretty much any brand of brass i want
 
Hammer101st said:
I dont have an 06 but i have brass for my 6.5-06AI and i want another straight 280 but the only 280 brass i can find is nosler and i will pass on that. So i figured if necked down 06 brass got me close i can use pretty much any brand of brass i want
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There's instructions on line the 280 is just the 06 necked down and in my opinion it's one of the finest 7MM hunting cartridges available.

This might help http://forums.accuratereloading.com/eve/forums/a/tpc/f/2511043/m/3631070901/xsl/print_topic
 
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Performance at the same weight of bullet is one comparison. Comparing bullets that are similar weight range for caliber is another, i. e. Comparing something like a 140 in 7mm to a 165 in 30.

My experience with the 7-08 says I get higher velocity, slightly better BC (really doesn’t matter to me really), slightly less recoil and the deer can’t tell the difference.
 
Hammer101st said:
Whats the .455 measurement a location? or diameter
Click to expand...
Diameter, but that's a guess as I don't have the print at hand. There is lots of neck length to manipulate as well. The 280-AI has gained in popularity on the Forums, but there were 30 and 35 degree shoulder versions out there back in the day. The RCBS @ 30 Degrees used to be somewhat standard I believe.
 
The 280AI is now a SAAMI cartridge. I have the chamber print not the cartridge print. The shoulder angle is 40 degrees. Chamber oal 2.575. Diameter at the body shoulder junction is 0.455 at a length of 2.0923. Dies, reamers, cases, and ammo are all available but maybe hard to find.
 
30-06 to 280AI will result in a short neck, and I assume standard 280 would be worse as the 280 has about .046 more case length.

I looked into the same as I was interested in a 280AI, but the scarcity of good brass and inability to use 30-06 cases has me looking at other plans.
 
If I’m understanding this, you’re just looking to neck down 30-06 brass to use in a standard 280 chamber? If this is correct, then your cases will be short on length and you’ll need to fireform the shoulder forward. If you’re going to order a custom reamer, to fit the shorter neck length, you could get a reamer in 7mm-06 as another option.
 
Just do a regular 280 chamber. You can use 270 Winchester brass since it's the same length as 280. Or just neck down the '06 brass in a 280 die to make a false shoulder and fireform (if you're intent on using Lapua brass). That .046" difference in the case length won't amount to a hill of beans in your shooting performance. You may have a little more carbon buildup there between the case mouth and the throat, but every rifle has that to some extent.
 
Ringostar said:
If I’m understanding this, you’re just looking to neck down 30-06 brass to use in a standard 280 chamber? If this is correct, then your cases will be short on length and you’ll need to fireform the shoulder forward. If you’re going to order a custom reamer, to fit the shorter neck length, you could get a reamer in 7mm-06 as another option.
Click to expand...
Yea i was just gonna neck down 06 brass and send it in for a reamer it dont even have to be a 280 chamber
 
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