.284 Shehane, anyone?

T

tobnpr

New member
I've fallen in lust with the 7mm for long-range...

Great performance with the 162 Amax in my 7-08 at 1000, and want some more boiler room to push that incredible boolit- and heavier 180's. 2900+ with the 180's...

The .284 Shehane seems to be "the unbeatable" 1000 yard caliber compromise of performance and barrel life.

Search here didn't turn up anything.

Anyone own this bad boy?

And if anyone has Quickload and time on their hands, how fast can that cartridge with RL-17 push the 162?
 
I have a mate who has built a 284 Winchester and managed to get 3100fps with Reloader 17 and the 162 Amax, has a 28" trueflight barrel.

Don't know what the difference between the Shehane and standard Winchester is, but if its any harder to reload than his 284 Win then I wouldn't bother as the amount of stuffing around hes had to do to reload for it is more than I would've liked, on paper its better than my 223 but if you cant load any ammo for it in reality its not that good:D

Hope this info is of some use.

Oh and the 3100fps was quite easy to obtain, I believe in load development he did have a few faster loads but was very happy with 3100.
 
The 284 Shehane is a moderately blown out 284, with 3% extra capacity over the parent case. Not enough gain to be worth the trouble, IMO. If you want more than a standard 284 Win in a short-fat, move up to a 7mm WSM.
 
According to this, it's 3.3 grains over the .284...which is a 5% gain in capacity- not insignificant- if I've done my figgerin' correctly.

http://bulletin.accurateshooter.com/tag/7mm/

The .300 WSM case is 79 grains capacity (H2O), and the Shehane is just under 70. Less powder burn, longer throat life? Real-world performance difference?

No aversion to a LA...

162 grains, 0.625 BC at 3100 fps...now that's what I'm talking about.
 
There is one gunzine writer whose rule of thumb is that the increase in velocity is 1/4 the increase in case capacity.
I somewhat suspect that the Shehane is being loaded hotter than the Winchester, and its blown out shape just shows fewer "pressure signs" in the manner of the AIs.
 
Thanks for the input guys.
Just happened to pick the American Rifleman that came a few days ago, and whaddyaknow... big article on the 7mm long range calibers, specifically the 7 STW.

I know that the 180's seem to rule here, but I keep thinking about the possibilities of pushing that 162 Amax...the 180 Berger has a .659, and the Amax a .625...not far off, and 18 grains lighter.
 
You dont want to shoot 1000 yard with an STW unless you have very deep pockets. The 7WSM and .284 Winchester are both great 1k rifles. I retired my WSM for the .284 Win.
 
The 284 seems to be about the upper edge when it comes to barrel life. As an example, when it's necked down to .264 barrel life drops.

That being said, I shoot a .284 Winchester that I had built on a M70 action. I shoot Sierra 168 Grain match bullets and H4831sc. That load stays comfortably enough above super sonic that I don't have to worry about atmospheric conditions to 1000 yards.

If I wanted to push that bullet faster I would go to the 280 AI. I would, like I do with the 284, have the neck cut a bit small so I can turn the case necks. Even release from the case neck is very important IMHO because it it does not release evenly then it can introduce a bit of yaw on the bullet before it is fully engaged in the rifling.
 
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While there's always the "cool" factor to the wildcats, it does seem that the .284 is a solid enough performer in it's own right, without the added work on brass and reduced barrel life.

I don't shoot competitively, and it seems that it's mostly that arena utilizing the "souped-up" sevens...and while that small amount of extra velocity can make the difference in competition, I'm not at that level- plus, I can use all the practice I can get doping the wind...not to mention a little better barrel life.

4D is selling Savage pre-fits in whatever flavor they have reamers for...
They have a .284 "match"- would that just indicate a tighter chamber?
They have two AI versions of the .280-Nosler, and Traditional. Difference?

Won't be running factory ammo, so being able to chamber same isn't a concern.
 
tobnpr, that extra velocity is not making a difference in competition. Right now the slower velocity cartridges, ie .284 Winchester are winning.
 
Here is interesting article on 7mm from F-Class shooters on the BR site

http://benchrest.com/archive/index.php/t-73530.html?

The F-Class World Championship held In Raton this coming Aug it's interesting the US F-CLASS Open Team is shooting 7mags with 180gr bullets yardage is 800,900 and 1,000 yds.

http://usfclass.com/home.aspx


Always interesting see what actually been shot. I'm out of match shooting but build me a pretty nice 284 and 280AI for hunting. I can close to having the Shehane build instead of the 280AI but since I did the 284 on a long action opt for the 280AI.
 
Interesting...
It says they're running 7mm magnums...all the same chambering, or does each shooter have the flexibility to select their own? Quite a few 7mm magnums...

Sorry 'bout the stupid question, don't know how the "team" operates.

I also noticed that they all the rifles are laminate stocks- I assume traditionally bedded receivers?

There doesn't seem to be a restriction in Open against chassis systems, which are all the "rage" these days- even for precision shooting.

Is there an inherent disadvantage to accuracy with a chassis system that I'm not aware of- or a restriction to their use that I didn't see in the rules?
 
tobnpr, I would assume entire team is shooting 7mag in the open vs what they might use Palma team since that is restricted certain caliber.

I think those rifles are pretty tricked out just about everything done to them and be within weight limit allowed and looking at the Sponsors list I'm sure they got help from them.

F-Open

Caliber limit of .35 and under.
Rifle weight of 10 kgs (approx. 22 lbs.).
Adjustable front rest allowed.
Rear bag allowed.
Rail guns not allowed.
3" wide forend.
Rifle must be shouldered when fired.
Tables are prohibited.

At 22lbs or close to it 7amg wouldn't be too hard to handle.
 
"There is one gunzine writer whose rule of thumb is that the increase in velocity is 1/4 the increase in case capacity."

Sorry but he didn't come up with that "rule of thumb".

It's a well known "law of physics"!

T.
 
How could that be?
A heavier projectile is going to realize proportionately less increase in velocity, than a lighter one, for any given increase in charge (?).
 
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