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270 Winchester Ackley Improved

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  #8  
Unread 12-04-2010, 03:18 PM
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Re: 270 Winchester Ackley Improved

Hello Ronpet I have a question for you Iím trying to build a .270 Win Ack Imp can you give me any feedback on this Wild Cat... Also can you share any load data that you have and what where your velocityís that where accomplish from this load.
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  •   #9  
    Unread 01-11-2011, 01:57 AM
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    Re: 270 Winchester Ackley Improved

    Ronpet-

    Did you ever complete this project and if so, what were the results?
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      #10  
    Unread 01-11-2011, 10:04 AM
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    Re: 270 Winchester Ackley Improved

    Quote:
    Originally Posted by ronpet View Post
    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!
    I just saw this and I have been a 270AI person for about 20 years. It's a wonderful round because the 270 win case is not big enough to hold the required amount of slower burning powders like IMR 7828. 270 win cases are extremely compressed loads when you put about 60-62 grains of powder in them.

    My AI also has a 29 inch barrel and was throaghted like a Weatherby .250 inches. so were are not exactly comparing apples and apples

    I only really shoot 140's or 150 SPBT for hunting and 115 gr. HPBT's for varmint days. I spent allot of time at the range with the chrono and R-22 and IMR 7828 with LR mag primers work the best.

    I've exceeded 3600 fps with 100 gr. The 115 gr BC is so much better and they can be loaded to near 3450 without case damage

    The weatherby 270 is poor choice. I've done chrono work and load development with a friends gun. You can stuff in about 5 more grains over the AI. But the cost of the cases .......... I did find out that most reloading books are very generous as to listed speeds of reloading data for guns like the Weatherby 270. They just don't do it on the range.
    __________________
    .270 Ackley improved 29 inch 1.250 dia. target barrel 7mm STW 28 inch 1.250 target barrel. I also love my .458 mag for varmints and the biggest game in the world.
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      #11  
    Unread 01-11-2011, 10:24 AM
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    Join Date: Jun 2007
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    Re: 270 Winchester Ackley Improved

    PO Ackley in his book, Handbook for Shooters and Reloaders Vol 1 states, "as the 270 is already overbore, little improvement can be expected... It is not recommended." Plus he gives no data for it as he considers the standard 270 better, which is another indicator.

    Just because one cartridge being AI'd shows a big improvement, does not correlate into all others especially one already overbore.

    Maybe with the newer powders it can work.

    BH
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      #12  
    Unread 01-11-2011, 11:12 AM
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    Re: 270 Winchester Ackley Improved

    Quote:
    Originally Posted by BountyHunter View Post
    PO Ackley in his book, Handbook for Shooters and Reloaders Vol 1 states, "as the 270 is already overbore, little improvement can be expected... It is not recommended." Plus he gives no data for it as he considers the standard 270 better, which is another indicator.

    Just because one cartridge being AI'd shows a big improvement, does not correlate into all others especially one already overbore.

    Maybe with the newer powders it can work.

    BH
    I have that same book "PO Ackley" It was all written with knowledge and data from basically pre 1970. This is before the days of 20 custom barrel makers making longer than 24 inch barrels and slower burning modern powder choices.

    I was just looking through that PO book the other day and he seemed to use very hot powders for the majority of loads and the slowest you see is like IMR 4350 or maybe IMR 4831. That is the stuff I use for my lightest bullets

    Yes, a 270 AI would be over bore for a 22 inch barrel. Poor old Mr Ackley would roll over in his grave at the site of Utra mags or something like my 30-378
    __________________
    .270 Ackley improved 29 inch 1.250 dia. target barrel 7mm STW 28 inch 1.250 target barrel. I also love my .458 mag for varmints and the biggest game in the world.
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      #13  
    Unread 01-11-2011, 11:24 AM
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    Join Date: Oct 2009
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    Re: 270 Winchester Ackley Improved

    Well I have not completed my project I have a Ruger M77 ultra light SS in 270 win. With a 22 inch barrel I guess that making it Ackley I will have to Re-barreled it and I canít afford doing that right now. But I will like to have one but dies are very expensive.
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      #14  
    Unread 01-20-2011, 02:56 PM
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    Join Date: Dec 2008
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    Re: 270 Winchester Ackley Improved

    I will have my 270 ai build back next week. Going start load work with rel 22 and 7828 and 130 and 140 pills
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