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Thread: 7.5x55 swiss loads

  1. #21
    Boolit Buddy

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    Think you are both right.

    The original chamber pressure spec for the K31 cartridge is 3200 bar or 46,000 PSI. The current CIP spec for the 7.5x55mm GP11 Swiss cartridge is 3800 bar or 55,000 PSI. Spec velocity is approximately 2600 fps with a 174 grain bullet, performance easily surpassed with safe handloads.

  2. #22
    Boolit Master madsenshooter's Avatar
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    Could be the 46,000psi was set because of the older rifles the GP11 could be fired in, but since they've sent all those to us, it's been upped. Don't know, but I have shot a few fairly hot, 2700fps+, 168gr loads in my K31 with no problems, no sticky extraction etc. This is with a K31 die that doesn't size the case as much as some others. I think that Swiss rifle website removed the pressure data out of respect for the older rifles available. The massive receiver of a K31 has to able to handle loads on par with the 30/06 in my opinion.

  3. #23
    Boolit Buddy j20owner's Avatar
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    Some 1911's were converted to .308 Win after being imported here in the states about 50 years ago.

  4. #24
    Boolit Buddy

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    I actually bought one in the early 70's and sold it in the mid 80's. Had an offset scope and a poor mount. It was fun to shoot. I broke the bolt stop somehow and had it brazed.

  5. #25
    Boolit Master madsenshooter's Avatar
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    What was I thinking, the diff is probably the same we've seen here in crusher derived pressures vs transducer derived. Same pressure, different #'s

  6. #26
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    Below 47k is goodn'uff for me. Thanks ...
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  7. #27
    Boolit Master Clark's Avatar
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    At least 6 years ago:
    7.5mm Swiss, K-31, 284 brass sized with Lee die, CCI200

    1) 168 gr Sierra .308 Match King

    a) 42 gr IMR4895 ok, kinda wimpy
    b) 45.5 gr IMR4895, ok, primer starting too flatten, 4" group open
    sights

    2) 189 gr cast w/gas check, .3095
    a) 28 gr IMR4895, ok, 10" group open sights

    I never shot those K31 rifles again.
    I put them in storage and have not thought about them since.
    I am not shooting again without a scope.
    I can't see the target.

  8. #28
    Boolit Bub
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    7.5 Swiss for schuetzen

    I recently acquired a nice old Martini-actioned Swiss Schuetzen in the 7.5 Swiss cartridge. I'm hoping to get it tuned up so that I can use it in the Centerfire, 200 yd ASSRA offhand matches next season. Loads on this thread seem pretty much relative to the bolt action rifles. Anyone have data/experience with cast bullet loads?
    IS there any significant difference in the earlier versions of the case?

    (FWIW I have not yet checked the other thread---might be all my questions are answered there)


    toDWS

  9. #29
    Boolit Master madsenshooter's Avatar
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    I'd do a chamber cast so you know just what you have. I'd mentioned Dave at CH4D sent me some CIP data sheets, one was titled 7.5x55 GP11 and from the drawing appears to be a tapered case. It doesn't have a shoulder! He had no idea what it was, nor do I. It isn't the GP11 7.5x55 Swiss military round!

  10. #30
    Boolit Master FAsmus's Avatar
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    The other DWS;

    Sure there are!

    My Swiss has not and will not shoot jacketed until it passes from my hands.

    My current #1 load is RCBS 30-165-SIL over 29 gr Varget. This is not a one-hole group load, especially with the military sights but is reasonably fast and shoots consistently for week after week.

    Also used in the process of load-working was RCBS 30-180-SP and various loads of powder. Things like (again) 29 gr Varget, or 22 gr IMR 4198 or 20 gr SR 4759 ~ this is really easy stuff to come up with since the 7.5x55 is very similar to the 7.62x51 and cast bullet loads may be transposed with good success.

    Good afternoon,
    Forrest
    Last edited by FAsmus; 09-11-2010 at 07:46 AM. Reason: typo error

  11. #31
    Boolit Buddy STP22's Avatar
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    K31

    Forrest,

    I`m with you in regard to never using j-word bullets in my K31

    The additional loads offered up in this post has prompted me to take additional notes as to some other powder choices I`ve yet to see referenced. Now that the weather has cooled off a bit I can plan on making a real effort to keep plugging away with what has shown promise a year ago, Unique and either of the RCBS Silhouette boolits....and now some other recipes too.

    My store of Varget is reserved for local F-Class matches for my Savage 6BRX.

    Scott

  12. #32
    Banned - Posts Deleted Because He Edited Them With Vulgarity When He Could Not Get His Way
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    K31 cast loads

    My favorite cast loads for the K31 are:

    22gr AA5744 F210 primers reformed WW284 cases, Saeco #315 175gr sized .311" and seated out so the bolt requires pressure the last 1/16" to close.

    The same as above with Saeco #301 200gr in PP cases.

    29gr H322 F210 primers in PP cases, 311644 sized .311" and seated to need pressure to close the last 1/16".

    The first (2) loads remain accurate to at least 500m. I've shot the latter load to 900 yards and was pleased with the perceived grouping at that distance.

    I DO have an RPA Paramount rear sight( much like the current RPA Trakker), so gives me 1/4moa clicks.

  13. #33
    Boolit Mold Mr_yeti's Avatar
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    I have super good 100 yd results with 12.5gr unique, hard cast 22 bhn flat nose GC .3095 170gr bullets. Can touch all 5 with my brother's scoped k31 and 2" iron sights on mine. both are mirror bore rifles and set bullets back to the first band in the case. (I dont have my calipers or journal handy). no leadinf either. clean as a whistle when i swab it.

  14. #34
    Boolit Bub
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    Maybe I'm O.T. and I do not know English, and the translator of my computer knows less than me !!!

    I have read that using bulletts .308 can have problems: people should use a 7.5x55mm Swiss Type S Bushing Neck Die, made by Redding, but in Italy it costs 4 TIMES the real price given by Redding !!! $ 550 !!!!!! + the busches !

    I think I calibrated the jacketed bullets with a bush .307: is that something you can do?
    For lead bulletts, I could use the .308 or .309 diameter instead. the BULLET SIZING KIT .308 or .309 of Lee precision costs almost as much as a bush !!!

    I have a Lee 312 MOLD DC CTL312-160-2R mold, but I still have not had the time to try it: did someone try this mold in K31? which diameter has calibrated the bulletts, and which powder?

    Thank you

  15. #35
    Boolit Man

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    Click image for larger version. 

Name:	19x2400-WLRM-170gc .68@50yds.jpg 
Views:	8 
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ID:	226822
    This is my best cast bullet 50 yd group so far in my 1911. It is a Lasercast 170fngc, 18grs of 2400, and a Winchester large magnum primer. I recently bought a NOE 312299 mold and working with that bullet now.

  16. #36
    Boolit Master uscra112's Avatar
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    A few years ago I came into a small quantity of 160 grain Eagan MX-3 bullets, cast very hard, gas checked. On the supplier's recommendation I used 21 grains of Blue Dot, for something over 2000 fps, in Norma brass, CCI LR primer. Rifle is dead stock K-31. I still can't believe how accurate it was. Original sights had me shooting half inch down to bug-holes at 50 yards off ordinary bags. Never followed this up, had other fish to fry, but in the last year I managed to scarf two very similar Eagan moulds off Gunbroker, and need to try it again.
    flectere si nequeo superos, acheronta movebo

  17. #37
    Boolit Buddy
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    Lyman 311413 spitzer with 25 gr 5744 does well in my K31 if a little dirty. The spitzer design lets you seat the boolit out far enough to keep the gas check in the neck. Only accurate to 200 yds or so but fun with the open sights. If I can hit the 6" gong at 100 yds with open sights without fail I am a happy camper.

  18. #38
    Boolit Buddy
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    The Lyman mold 311414 for the 300 Savage works well in the K31.
    20 grs of 2400 and bullet GCed and sized .309 works through the
    magazine and chambers with no hangup. 1 in groups at 100 yds.
    The 311414 by lyman is discontinued, but NOE makes a copy or
    you could use the NOE .313-150 Ranchdog mold as well sized to
    .309.

  19. #39
    Boolit Buddy
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    Quote Originally Posted by airone46 View Post
    Maybe I'm O.T. and I do not know English, and the translator of my computer knows less than me !!!

    I have read that using bulletts .308 can have problems: people should use a 7.5x55mm Swiss Type S Bushing Neck Die, made by Redding, but in Italy it costs 4 TIMES the real price given by Redding !!! $ 550 !!!!!! + the busches !

    I think I calibrated the jacketed bullets with a bush .307: is that something you can do?
    For lead bulletts, I could use the .308 or .309 diameter instead. the BULLET SIZING KIT .308 or .309 of Lee precision costs almost as much as a bush !!!

    I have a Lee 312 MOLD DC CTL312-160-2R mold, but I still have not had the time to try it: did someone try this mold in K31? which diameter has calibrated the bulletts, and which powder?

    Thank you
    airone46, The Lee 312 mold 160-R2 might work, but the nose might be too big to
    chamber. My K31 measures .307 bore dia. I size the 311414 bullet to .309 and
    have no problems, The 311414 tappers down similar to the swiss bullet so slides
    in nicely. All you can do is try the Lee bullet. I don't know what powders you have
    over there. I use 2400 and AA2520 powder and start at 20 grs. and work up till
    you find the load that works best.
    webfoot10

  20. #40
    Boolit Master uscra112's Avatar
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    You remind me that mint K-31s are said to have a short throat and leade. If not worn, bullets with a fat ogive won't chamber. Which leads back to the 311414 as being a good choice. Mine IS worn, else that Eagan I mentioned wouldn't fit.
    flectere si nequeo superos, acheronta movebo

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check