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Thread: .257r ai

  1. #1

    .257r ai

    can anyone enlighten me on how good this calibre is?

    I am looking for a 'middle ground' to my .243 and my 30-06..perhaps funded by the sale of my .243,, and with the addition of a lighter .223 calibre as well.

    what do you think of the .257R (AI?)...my other choice would be 6.5-284 - this would be for fox, roe, and sika.

    is the .257 not very very similar to a 6.5x55?

    sorry for another 'calibre' post but what is a man supposed to do, wikipedia and 6mmbr.com doesn't 'reply'

  2. #2
    IMO it won't do anything a 25-06 can't. One advantage to be fair would be the cases may stretch a bit less than the 25-06. My 243AI hardly ever needed trimmed.

    still think that the way to go nowadays, especially for a calibre to sit nicely between the others you mention is the 6.5x47Lapua or a .260

    I know a custom rifle builder who builds more rifles in these calibres than anything else nowadays.

    brass for either from Lapua as well, and a good choice of middleweight bullets.

  3. #3
    Quote Originally Posted by jamross65 View Post
    IMO it won't do anything a 25-06 can't. One advantage to be fair would be the cases may stretch a bit less than the 25-06. My 243AI hardly ever needed trimmed.

    still think that the way to go nowadays, especially for a calibre to sit nicely between the others you mention is the 6.5x47Lapua or a .260

    I know a custom rifle builder who builds more rifles in these calibres than anything else nowadays.

    brass for either from Lapua as well, and a good choice of middleweight bullets.
    thanks...6.5 creedmore too perhaps

  4. #4
    yes looking at the load data with 120 grain bullets the 257 ai is around the same speeds at the 25/06 with maybe a little less powder but not much.

  5. #5
    have a 257 roberts ai it shoots 115 vld bergar @2950 fts and case life is really good .
    very rare to have to trim. really nice cal to shoot,
    but very much on par with the 25/06

  6. #6
    PKL, i have a .257R AI and also have have a .243, 30/06, 6.5/284 and have had a ,25/06 so i will give you my thoughts on it. The cartridge is obviously a handloading proposition only. However you can fire factory .257Roberts cartridges in it if required, and you will do this to make the AI cases anyway. Factory .257 R ammo is limited in projectile choice and pretty lame in performance. In my .257AI, I use 51.5 gns of H4350 behind 100 gn Nosler BT in WW +P brass for 3300 fps in a 24" tube. Using H4831 or N160 i will get 3000 fps with a 120 gn pill.

    This performance is similiar to a 25/06 using factory ammo, better than a .243 using 100 gn factory and dammm close to a .270 win 130 gn loading with the 120 gn load.

    Recoil is mild and you do not get the blast that you do with a .25/06 (we are mod free here). The roberts IMO needs a medium (BSA, M98) or std long action for best performance. They have been made on a short action but with 120 gn pills you need to seat them in to functionin the action at the cost of powder capacity in the case.

    The 6.5/284 really shines with 140 gn high BC pills for long (500m +) distance shooting, paper or game to red deer size but likely you want a bit of wt and length in the bbl and rifle to shoot well at these distances and its not so great for stalking.

    For stalking fallow in open country the .257r AI is a nice choice but likewise is your .243win, the .260, 7 mm/08, .270 win or your 30/06 with 125 or 150 gn pills at 2950 fps.

  7. #7
    Very intersting thread!!!
    I think all different calibers are different things to different people ( we ether love or not much for them )
    As long as they are accurate is the key here!!!!
    My personal experince has been 6PPC / 243 Ackley / 6.5-284 / and now own a 308 and a 6.5-55 Improved!!
    All very accurate tools which were a pleasure to use!!
    My 6.5-55 Improved is running the 123 A-max at 3000fps - cracking tool for long range target / varmint , Foxing and for stalking!!
    If you can get a chance see if you can " try " the caliber you fancy if thats possable!!!
    Be intersting to hear when you decide what you go for!!

  8. #8
    If you are have decided you wish to use a `wildcat` cartridge and are looking forward to the extra work involved in such, then the 257R Ackley is as good a cartridge as any. Nothing wrong with that though, i do it myself and look on it as a complementary `hobby`to my Stalking.
    The 257R Ackley is the Ballistic twin of the 25-06 so if it is not a project you are looking for then the 25-06 is the much simpler option.
    If you fancy a 25 wildcat take a look at the 250 Savage Improved. P.O Ackley looked upon it as his most successfull adaptation of a factory cartridge.
    Yorkie.
    Last edited by Yorkie; 19-02-2012 at 15:12. Reason: spelling

  9. #9
    If you wish to go Improved and don't mind a longer case then I just happen to have a nice sharp reamer for the .280AI .

    And of course .270 Win being sooooooooooooooo unpopular in some places means a nice donor is easy to come by. Just thought I would mention it.

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