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270 Winchester Ackley Improved

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Old 05-13-2007, 05:03 PM
Junior Member
Join Date: May 2007
Posts: 4
270 Winchester Ackley Improved

Can anyone tell me about the A.I.? There is not a lot of information out there about this wildcat.
Is there enough of a ballistics improvement over the standard 270 win to warrant the upgrade. How's accuracy?
Would the 270 WSM be a better choice.
I sure appreciate any feedback!
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Old 05-13-2007, 05:54 PM
Platinum Member
Join Date: Aug 2005
Location: Back in the south -NW FL..
Posts: 1,142
Re: 270 Winchester Ackley Improved

The AI will give you 100-150 fps over the standard cartridge of coarse YOUR mileage will vary.

The AI will cut the trimming of brass way- way back.
Berger has some .277 vld bullets coming out at the end of the summer -i'm thinking about a 270 AI myself in the future.
Should make a nice 6-700 yard pronghorn whitetail cartridge.

The 270 wsm is a great cartridge also if you plan on shooting farther a bigger powder charge can't hurt.
Accuracy w/ both will be great providing you have an accurate rifle.
There is good brass for both cartridges and plenty of great bullets in the .277 size.-Mike
AIPAC for president !!!!!!!!!!!!!!!!!!!
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Old 05-13-2007, 10:42 PM
Silver Member
Join Date: May 2007
Location: California
Posts: 458
Re: 270 Winchester Ackley Improved

What about the old .270 Weatherby? It's got more oomph than either the 270 AI or the 270 WSM.

IMHO the 270 WBY with the Nosler 150gr partition is the best available all around thin-skinned game cartridge.
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Old 05-14-2007, 12:56 AM
Junior Member
Join Date: May 2007
Posts: 4
Re: 270 Winchester Ackley Improved

Thanks for the information.
The 270 weatherby and the 270 wsm both would require opening up the bolt face to accept a larger cartridge.
I've got a Sako 270 win standard action and I will probably try the AI which would only require rechambering to achieve almost the same ballistics improvement. Less money and I can use my 270 win cases.
I would like to know if anyone can point me in the direction of loading data for the 270 Ackley Improved?
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Old 05-14-2007, 07:56 AM
Gold Member
Join Date: Oct 2002
Location: York, Pa.
Posts: 588
Re: 270 Winchester Ackley Improved

Heres the link form Steve's pages for the 270 Gibbs similar to to the AI, http://stevespages.com/277_7_130.html
Most improved cartridges can use the max loading for the parent standard case as a good starting point for a particular wildcat. I suggest to start one grain lower than the max standard case loading though to see how a particular powder/bullet respond in your new chamber. If you using older brass with some loading on them I would suggest new brass to fire form or annealing the older stuff as you may split some necks or shoulder areas which will burnish your chamber (not what you really want to happen). Brass is cheap for the .270. You will need a strong load to form the brass correctly. Your 'smith should be able to offer some directions for you to achieve success. FWIW
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Old 05-15-2007, 08:18 AM
Gold Member
Join Date: Aug 2005
Location: Mouth of Hobble Crk Canyon, Utah
Posts: 597
Re: 270 Winchester Ackley Improved


I have zero knowledge of the 270 Ackley. What I do bring to the table is personal experience with the 30-06 Ackley. Same concept! From what I gleam, you are keeping the same barrel and just having the chamber opened, so velocity increase from that end will be zip, nada, none. I went from a 22" factory Rem barrel to a 26" SS custom Lilja, along with pushing my pressures, I recongnized a 300 fps increase w/ 180's (2750 to 3050 fps).

Like you, I wanted to be able to maintain as much of my previous assortment of components and reloading equipment with out having to re-adjust for an entirely different cartridge/caliber combo. I was able to keep the reloading die set up inexpensive by using the wonderful Lee Collet Neck Die. Works great! Though after 3-4 firings, chambering a round becomes difficult due to not setting back the shoulder. Thus my purchase of a Redding custom body die; probably about $70 for you. Call Redding direct for that purchase. I already owned the wondeful Forster Ultra Seater die in 30-06. Forster sent me an Ackley floating chamber which kept me from having to purchase an entire seating die; about $45.

I did some looking around for propellant charges and ran across a guy who goes by the name of "Ackley Improved User" over on www.accuratereloading.com. He had used an interior ballistic load program (having a senior brain fart at the moment and can't remember the programs name) which when you plug in all the gun/caliber/powder/bullet specifics, gives suggested load data. He then personally tested the load data and discovered a load which was A-typical for the '06 Ackley but worked wonderfully. I too, tried his load of heavily compressed charges of Reloader 25 pushing the Nosler 180 BT or AB and immediately hit upon 3/4 MOA loads at 3050 fps.

Good luck in you endeavor.
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Old 05-25-2007, 08:50 PM
Junior Member
Join Date: May 2007
Posts: 4
Re: 270 Winchester Ackley Improved

Thanks. A lot of good solid information.
I feel confident to continue with this project.
I think it will be accurate enough to accomodate several huting scenarios, including 800-1000 yd. varmits.
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