6.5x55AI load info needed

Discussion in 'Big Stuff -- 6.5mm, 7mm, 30 Cal' started by glider, Feb 10, 2017.

  1. glider

    glider

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    Building 6.5x55AI on M70 win 270 PF action 1964 blue printed LA, Bartlein Marksmen cut 26" 1:8

    Am thinking Varget or H4350? behind BC. 155s and BC 141s along with JLK 130s all in Lapua Brass.

    Experienced shooters using 55 AI data will be appreciated
     
    Last edited: Feb 10, 2017
  2. rardoin

    rardoin Silver $$ Contributor

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    H4831 for the win:D. Seriously though...leave the Varget on the shelf, perhaps H4350 with the 130's but for the 140+, H4831 (I use short cut, sc, version) has the burn rate, temp stability and density that is about as perfect as you can get in Hogdon powder. 50.5 (+ or -) .2gr of H4831sc will get one of Bob's 141.5's at 2925-2950fps with plenty of room to spare. I would start at 49.5gr with the 155's and work up from there. I shoot the Bob Jordan AI with Berger 140 hybrids/ BR-2 primers/ 50.3gr H4831sc at 2936fps in a 30 barrel.
     
  3. BOB LEE SWAGGER

    BOB LEE SWAGGER Silver $$ Contributor

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  4. rardoin

    rardoin Silver $$ Contributor

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    As far as dies....it depends on your reamer. There are a few versions of the 6.5 x55 that are 'improved' chamberings. Redding has a 6.5 x55AI die but it may or may not work with your reamer. The best solution is to fireform about five rounds, twice each, to get them to a good fit to your chamber. You can set up a 6.5 x55 die to size the upper portion of the neck to allow the second loading...just keep it off the shoulder area when doing so. Then you can send the cases of to get custom dies made (Redding, Whidden, Forster etc.). I was fortunate enough to buy my reamer and a Warner Tool Co. custom die off a member here (thank you JRS:)) so I was able to avoid that step. If you do not have an aversion to spending your kid's inheritance, the WTC die is phenomenal. I have had them make inserts for my other current competition chambering and will soon be sending them brass for a new gun.

    Do you have the reamer yet?
     
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  5. glider

    glider

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    Yes manson made a reamer for me .295nk 160 fb. Will turn necks .003 to clean up all imperfections on L.brass.
    As for dies i sent print to guys at Redding to confirm there AI dies work . Die set uses type s bushing fl resize and NON COMP seater.
    Standard Comp Seater, will be reamed with chamber reamer to creat comp AI seating die . Sleeve is not hardened steel.
    Im currently shooting a 30 imp 260 with tight nk . Which is impressive . Thinking to get those 155s off around 2980 plus with 55AI
     
    Last edited: Feb 10, 2017
  6. glider

    glider

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    Heres print for reamer spec.
    Because of neck i think ill jam and FF
     

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  7. huffmanite

    huffmanite

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    My M70 is a large ring Zavasta 98 mauser rifle.....assume yours is too.

    FWIW, shoot with a gent who has his version of a 6.5x55 A.I. that's on a Remington 700 action. I own a standard 6.5x55 built on a Stevens 200 action. I also own a couple of 6.5x55 Swedish military rifles....small ring mauser actions.

    Gent with the Remington action 6.5, when working on a load with a new powder he will start at recommended MAX and work up from it. Needless to say, he's after maximum velocity with no pressure signs. With my Stevens 200 action rifle, I generally start at a couple of grains below max and work up from there. I do not go much over Max. I certainly do not do this with my Swedish military rifles.

    You may want to visit the Alliant Powder website for load data and check their 6.5x55 load data for their powders. Its interesting. Alliant shows separate load data for military action rifles and commercial action rifles in the 6.5x55. Basically, what is the max load for a military action is below the start load for a commercial action rifle for the powders they recommend.
     
  8. glider

    glider

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    Correction 2880 plus
     
  9. rardoin

    rardoin Silver $$ Contributor

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    How's it going with the AI? What bullet are you currently shooting?
     
  10. glider

    glider

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    Hey How are you Thanks for asking I have been looking for max case capacity with no luck , After taking your advice I am up to 53.2GR H4831sc which pushes 141.7BC's 2880 ish . So I am trying to understand if this batch of powder is slower ?
    As you probably know Bob is not making bullets and has sold his equipment , We talked about his 141's and 155's, his advise was 141.7 like to group tightest around 2850 f/s. as for 155's they are accurate just difficult to group .
    On the other hand Whats the magic word to have Warner Tooling make anything , I waited a year for dies and finally said 'come on, send everything back I have to go in a different direction. Whidden is just as good . I consistently have .0005-.0010 runout with there dies.
    Rardoin when I started building 6.5x55AI I was trying to keep rifle, m70 winchester, which I had as a kid into PRS style, all position rifle.Keeping a traditional look . 1st pic att.
    Once I started to shoot 600 800 1k yds I was impressed how well everything came together , so i took it another step . This time bedding on a fully adjustable stock , which came back only two months ago.
    What I am thinking with long action is to shoot Warners flatline 121gr. 3100f/s
    Just not sure where to start with powder. Finding a sweet spot can get expensive !! Can I start with 55 gr of H4831 sc with 121 gr bullet ?
    Also ballistics for a 130 JLK at 2950 plus are just as good as 142s smks 2880 so I still do not have a go to load .
    How about you what are you shooting?
    Most of my time has been focused on 260 imp 30 .295 nk 160FB , 28"BBL M24 Bartline shoots lights out ! 142 smks 2900 fs . For short action this is my stand by set up . looking forward to figuring out 6.5x55AI , any input will be appreciated.
    THX
     

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    Last edited: Jan 8, 2019
  11. rardoin

    rardoin Silver $$ Contributor

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    Since I have last posted data I have started shooting Precision Ballistics 142gr over 48.5gr of Alliant RL-23. This gives me 2940avg fps out of a 30" barrel. As you may know Bob C. passed away last year hence my switch. I have shot the 140 JLK's with good results when I had trouble obtaining the PB's but that shortage issue was solved and I stopped development with the JLK's. I would suggest giving RL-23 a try as I get more velocity with reduced charges over H4831sc and the throat wear is definitely no worse and seems possibly less with RL-23. My fired case capacity is 61.0 grains of water with Lapua brass.
     
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  12. Evlshnngns

    Evlshnngns Silver $$ Contributor

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    My BJAI swede has a short throat, I had some light ejector smear at 51.3 of h4831 pushing a 140. I'll be watching this.
     
  13. rardoin

    rardoin Silver $$ Contributor

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    I can't find the reamer print but IIRC my freebore is .188". This puts the 150 SMK's boat-tail junction just at/slightly above the neck/shoulder junction and 142 SMK's, 140 hybrids and 142 Prec. Ballistics well off the junction loaded out to 0.020" off light touch. After a couple of hundred rounds the 150's can be seated out further and away from the n/s junction...if one is concerned with it.
     
  14. glider

    glider

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  15. flatlander

    flatlander

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    I was initially a little disappointed with the small amount of extra velocity I got out of the 6.5x55 AI vs the std 6.5x55. However, accuracy was at least as good, and going the AI route did away with the need to trim cases after every other firing. I was getting 2912fps with N160 & S142MKs out of a 30" Krieger medium Palma; after re-chambering to the AI version, I got a whopping 40-50fps more velocity.
     
  16. glider

    glider

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    Any experince comparing 6.5x284 load data to 55AI for referencing starting point regarding load development
     
  17. rardoin

    rardoin Silver $$ Contributor

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    But you'll get there with better case life. Depending upon powder chosen (and utter disregard for barrel life;)...you can get into the low 3000's with a 142 IME.
     
  18. rardoin

    rardoin Silver $$ Contributor

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    I used the recommendation of 4 grains less than the same powder/bullet in a 6.5/.284.
     

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