Talk to me about .270win AI

WhelanLad

WhelanLad

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guys I dunno why I didn't think of it before... maybe because I wanted a slightly larger bullet rather than case capacity.. but for me a Ackley job on the extisting cartridge would cost me a lot less an I would have something a little different.

Whats people thoughts on the .270 AI ?
what will I gain?



I have a Remington 700 sps


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As some are aware I use varget in the .270 but that's about to change anyway, to 2209 (from 2208) as with 2208 it would be pointless to AI as only half the case is full of powder an pressures are up.. So going to the slower , more suitable powder is a must.

I would proberly try use around 140gr projectile, maybe even 150gr


See how this discussion goes

thanks

WL
 
ok great.


will AI slow case growth down? im guessing I have a slight headspace problem an im only neck sizin my brass now, doing the AI will clean all that up at the same time as if I were goin to get it headspaced?

Cheers

WL
 
I'm not a hater (I have rifles chambered for a 257ai and a standard 270 win) but the word is PO Ackley is said to have found the 270ai to be a waste, more powder burned with no appreciable increase in performance. If you want, send me your email in a PM, I have a PDF file with some information on the Ackley Improved cartridges if you are interested.
 
Complete waste of time and money to convert to AI. You could rechamber to 257 Weatherby, but then that would involve opening up the bolt face, and playing with the feed rails - the latter of which not many 'smiths in my experience are capable of doing well. If you did all the above, you would have probably spent half+ of the price of a new Vanguard 2 chambered for 270 Wby. I'd go the latter route.
 
WhelenLad, I have to agree that, for practical purposes, it's not worth it. I've never found the .270 to be particularly bad for stretching brass, and for a likely 75 fps velocity gain, you'll be paying quite a bit. It's not like the game will tell the difference.

I'd reccomend getting a separate .270 WSM or (even better) a .270 weatherby (make cheaper brass by running 7mm rem mag through your dies) if you want more performance. I'd do a separate rifle since you may very well find no practical difference on game at normal ranges with 200 - 300 fps difference anyway, and you may go back to your current .270. And an extra rifle is always nice, too! :)
 
WhelanLad said:
ok great.


will AI slow case growth down? im guessing I have a slight headspace problem an im only neck sizin my brass now, doing the AI will clean all that up at the same time as if I were goin to get it headspaced?

Cheers

WL
Click to expand...

Why are you guessing you have slight headspace? What symptoms are you diagnosing?

I am guessing you don't realize the difference between headspace and cartridge case head clearance... Headspace is set and fixed when the barrel is assembled to the action. It is measured with steel gauges to determine just what it is. Cartridge case head clearance is completely adjustable by the person reloading the ammunition, and a rifle with excessive headspace can have ammunition loaded for it that has zero case head clearance. I think adjusting your loading procedures will be an easy 'fix'... hopefully as the other options cost a lot...
 
If the 270 isn't doing it for you, I'd say get a 7mm rem mag.

Amazing bullet selection for 7mm, gives you that extra umph, and you can actually find ammo in stores, unlike a 270 wsm or weatherby.
 
WL. You don't know what your missing not having a rifle chambered in an "as if" cartridge. Here is a run thru on how it's done.

Take your well worn rifle to a gun plumber, have him re chamber and set the barrell back. Have him cut and crown the barrell at 20 inches. Have him order dies too. Come back in a few months with $350.00 and retrieve your new magic musket and dies.

Now spend a day pissing away components to get some fire formed brass to use in your new dies. Now fill your new As If brass to top of the case neck with magical pixie dust and seat a bullet, don't forget to crimp the bullet in place, make at least 20 rounds.


Now it's finally time to shoot your new pride and joy. Put up a BIG target at 50 yds and let fly at with all 20 rounds, trot down to the target and find the 3 bullet holes that are closest together an cut them out. This will be your wallet group and the pet load in your rifle! You can use your "wallet group" to impress drunks and pick up ugly chicks down at the local water hole.

All that's left now is to take a wild ass guess at the velocity of of your pet load. No need for a chronograph, the huge fireballs coming out of the muzzle tell you that it's at least as fast as a Weatherby.

All that's left now is give yourself a Internet user name that uses Ackley in it and spread bullsh!t like only an expurt can.
 
jj-65 said:
wl. You don't know what your missing not having a rifle chambered in an "as if" cartridge. Here is a run thru on how it's done.

Take your well worn rifle to a gun plumber, have him re chamber and set the barrell back. Have him cut and crown the barrell at 20 inches. Have him order dies too. Come back in a few months with $350.00 and retrieve your new magic musket and dies.

Now spend a day pissing away components to get some fire formed brass to use in your new dies. Now fill your new as if brass to top of the case neck with magical pixie dust and seat a bullet, don't forget to crimp the bullet in place, make at least 20 rounds.


Now it's finally time to shoot your new pride and joy. Put up a big target at 50 yds and let fly at with all 20 rounds, trot down to the target and find the 3 bullet holes that are closest together an cut them out. This will be your wallet group and the pet load in your rifle! You can use your "wallet group" to impress drunks and pick up ugly chicks down at the local water hole.

All that's left now is to take a wild ass guess at the velocity of of your pet load. No need for a chronograph, the huge fireballs coming out of the muzzle tell you that it's at least as fast as a weatherby.

All that's left now is give yourself a internet user name that uses ackley in it and spread bullsh!t like only an expurt can.
Click to expand...
LOL!!!!Laugh2
Not officially informative, however I had a good laugh!
 
Hey guys thanks for the discussion on this.

I will also agree that the AI wouldn't be worth it as its been mentioned. it would however be different but im not that keen on being too different.

I would also like to take note of the 270wsm, I think the 300wsm has shyed me away from wsm cartridges although the 270 would proberly be more up my alley than the 30 was.

the 7mm is kind of calling my name an I would like it to be in form of 280remington, although im going to wait until I put a bunch through this tube an it begins to be 'shot out', so ill come back after 7,000 rounds or so LOL...... im kind of tossing up between a 7mm in short or long action, im quite content with the 308 as the all day walk about, the 270 as a longer range shooter..

im kind of stuck with room in the safe an cant fit another rifle in, so im saving the money for a while an will try cull a few rifles off, 270/308 an put it into one lightweight 7/08 proberly!

WL
 
If I wanted a 270 that was more than the Winchester I would build a 270 Weatherby. But that's a lot of plumbing with a standard bolt face.

There's no reason not to unscrew your barrel and have an AI reamer run into it, just don't expect it to be world changing.
 
I would try using slower powders with your existing chamber and see what you get before making irreversible changes to the rifle. I'm not familiar with the powder selection you have there, but something like H4831 or RL 22 or the equivalent would be much better than varget. If you do rechamber, it will be hard to know if you have any improvement if you don't know what the rifle is capable of currently.

I tend to like cartridges that are a little odd-ball or uncommon, but I've never had any desire to AI any of my rifles. Seems like an expensive way to ruin the resale value of a rifle with questionable gains.
 
BigUglyMan said:
If I wanted a 270 that was more than the Winchester I would build a 270 Weatherby. But that's a lot of plumbing with a standard bolt face.

There's no reason not to unscrew your barrel and have an AI reamer run into it, just don't expect it to be world changing.
Click to expand...
....... or just buy a 26" 7Mag.
 
I built a 270 ai, 24" ron smith barrel on a trued 700 action in a custom walnut stock. i run 130grn barnes around 3000fps. that just seems to be the speed bracket that my gun likes, my load is 56.5 grains rl 19, large win primer. i would suggest trying other powders as has already been suggested, rl-22 with the heavier bullets might work, otherwise i would try some 4350
 
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