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I didn't chrony these loads but they shoot OK.
Good enough to carry anyway.
After three attempts I've given up trying to rotate these pics on photobucket.....they just wont "save".
[Linked Image]
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"after the bullet leaves the barrel it doesn't care what headstamp was on the case"
"The 221 Fireball is what the Hornet could have been had it stayed in school"
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Originally Posted by AussieGunWriter
I am working with a 280AI at the moment with a 22" barrel. I will post some load development work over the next few weeks. Still forming cases at present and the loading is just beginning.

Starting with 160gn Accubond's, 150gn Partitions and Ballistic tips, 145gn LRX's 110gn and 120gn TSX's, 154gn Hornady's, 140gn Woodleight's and whatever else I can find on the bench.

It will be easy to add about 25fps per inch to suit your preferences.

John


I had originally built my son's 280AI with a 24" barrel. After the first season we took it back to 22", handles much better, looks better and we lost a whopping 35fps, 145 LRX's still run 3150 with much Rel22.

My rifle in the above post is 23". I may take it back to 22" this winter.


"after the bullet leaves the barrel it doesn't care what headstamp was on the case"
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Originally Posted by Ackleyman
You should be able to get 3000+ fps out of a 22" barrel with 140 grainers no problem. I get 3120 with my favorite 140 grain load with a 23" barrel without pushing it. There is probably a little more there but I have been happy with that load.


I have run 3075-3150 out the the standard .280 with 139s/140s for years in a 24" bbl. Clearly, I could get a little more with an AI, but like other's have said...not dissin' the AI, just doesn't trip my trigger. I like the .280, or the 7MMRM if I want more...which I really don't.


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I think there is too much emphasis in comparing this cartridge to the 7mm Remington which doesn't draw a clear picture in my mind.

What I am looking for is to see where it compares to the 7x57 as apart from case length and capacity, the actions and case heads are the same.

If many determine the .280 is a step up from the Mauser, then the A1 could/should be 2 steps up which means the same performance with a little flatter trajectory.

If such a performer can still be build in a light rifle with 22" barrel with the same/similar yield, it may interest me for a longer trial period.

John


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7x57 runs 140's around 2,750. A 280AI is all the ass you can get behind a 7mm bullet in a .473 LA, and I believe a Montana comes in around 5#10oz.

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Let's answer Aussie's post above: ballistically speaking, how much gain would he get going 280AI over a 280? Are we talking a 1/2" at 300 yards, 1" at 600 yard, etc?

Read his parameters...

I'm not being a smart ass, I would like to know myself. I've thought about and looked at many tables, but it's all different...and I don't have one to comment about. I have pondered it a bit myself though.

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I have not owned a 280AI but have had a substantial number of 280's and 7 Rem Mags.,and loaded for the 7x57 in 3-4 rifles enough to get a handle on what it will do compared to the others.

Using 140 gr bullets in each this is where I landed,across the board with each and using mostly 22" barrels in the 7x57 and 280,and 24" in the 7 Rem Mag:

-7x57,2800-2850.
-280, 3000-3050
-7 Rem Mag, 3200-3250.

Caveats: I think the 7 Rem Mag is best suited to bullets 150 gr to 175 gr,and with these it's going to show a velocity advantage over the smaller cartridges. I have run 140's as high as 3300 from the cartridge with no ill effect,but stoop at the 3200-3250 level because there is not much to be gained pushing harder.

In load development with the 280,I have pushed the 140's over 3100 with no ill effects,but found case life better under 3100 fps.

I have not owned the 280AI,and with the above numbers in mind maybe some can see why...yes with a 26" barrel and warm loads it will get close to a 7 Rem Mag but if you give them both the same barrel length and load to the same pressures the 7 Rem Mag will get the same velocities easily.

Someone will come along and talk about SAAMI pressure limits at 65,000 psi for the 280AI and well below that with the 7 Rem Mag,but a look at the Nosler manual shows that even given that the 7 Rem Mag still gets more velocity and the 280 AI is shown with a 26" barrel while the 7 Rem Mag has a 24". I think we have to assume that Nosler is loading both to SAAMI spec.

Another factor to consider is that manual data only sometimes matches what we get in our rifles,and the average hand loader has no idea if he is operating at SAAMI spec or not. So those giddy velocity figures of a substantially smaller case equalling a larger case for velocity are frequently pie in the sky. For this reason I like to rely on a larger case if I want to be certain of reaching a given velocity level.

To my mind the 280AI sits, in case capacity and velocity, right between the 280 and the 7 Rem Mag, but that is a pretty thin niche to fill. It will also give more velocity by a good margin over the smaller 7mm's like the 7x57 and the 7/08 with the same bullets.

In terms of trajectories there seems to be about a 4-5" difference at 500 yards between a 140 gr 7mm AB started at 3000 fps and working up to 3200 fps.....not really a huge spread since that sort of difference could be lost in group size and normal shot disbursement,depending on rifle, load,and shooter

If I were looking at a 280AI it would be a choice based more on the rifle than any advantage of the cartridge. I can live with anything that gives 3150 with a 140 gr bullet,or 2900 fps + with a 160 but since I get those numbers without breaking a sweat with the 7 Rem Mag,I have no need for a 280AI.



BUT....something like a Kimber Montana in 280 AI is pretty unique in a lightweight rifle and if it had existed 30 years ago I may not have gone to all the trouble I did building lighter weight 7 Rem Mags. In a light rifle that is a tough combo to beat.I would like it as well in 280 Remington.

I don't think any of them will kill stuff ay deader than a 7x57 but the velocity differences are there if you want them.

Last edited by BobinNH; 11/27/14.



The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Originally Posted by Dooger
Let's answer Aussie's post above: ballistically speaking, how much gain would he get going 280AI over a 280? Are we talking a 1/2" at 300 yards, 1" at 600 yard, etc?

Read his parameters...

I'm not being a smart ass, I would like to know myself. I've thought about and looked at many tables, but it's all different...and I don't have one to comment about. I have pondered it a bit myself though.



If 270's are "gay", then its the wierd uncle that plucks his eyebrows. 140 TTSX at 3,100 is about 1" less drop / 1.7" less drift than a 130TTSX doing the same speed in a 270. At 500 yards.



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That pretty much sums it up, 16. The comparison for me is to other .473 LA selections. There isn't a lot to exploit--but it is there.

I do run my 7x57 warmer than 2750...:)

Mags are a different kettle of fish between my ears. A significant jump up in powder demands and recoil when loaded to their potential. A guy can easily build them as light as a 473. Did that once. Repented.

Have had a number of light 280AIs built over the years from a Forbes and RI on down but the Montana and factory brass is a lot less moolah and hoop jumping.


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