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Thread: Has any body tried PP .270 j-words to 7mm

  1. #1
    Boolit Master brstevns's Avatar
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    Has any body tried PP .270 j-words to 7mm

    The title says it. Wondering if anyone has tried to PP 270 cal j-words for use in the 7x57? If so how did it work out?

  2. #2
    Boolit Buddy Old Coot's Avatar
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    Lots of people have patched up jacketed bullets to shoot in a larger bore rifle when they couldn't get bullets of that size. If you try roughen the jackets of the 270 bullets between two files by rolling them back and forth between the files. It gives the paper something to hold on to. Without that roughening the bullet tends to squirt out of the paper jacket and accuracy is nill. Brodie

  3. #3
    Boolit Master
    barrabruce's Avatar
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    Yes.
    Exactly as old coot said.
    Roughen up the bearing surface so the patch will stick to it.

  4. #4
    Boolit Master Bazoo's Avatar
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    Wow! That's something I've never heard of before.

  5. #5
    Boolit Master brstevns's Avatar
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    Wii give it a try.

  6. #6
    Boolit Master
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    I have done a 308 to 314 for a 303 Brit, shot a couple of decent groups just to see if it would work. As Old Coot says roughen up the jacket. I also used a light wax or lube and let the patch just go over the ogive. Also expand the neck and bell the case mouth as you would do for cast.

  7. #7
    Boolit Master Nobade's Avatar
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    Never tried J-bullets but the RCBS 270 boolit patched works a treat in my 7mm TC-U Contender.
    "Quemadmoeum gladis nemeinum occidit, occidentis telum est."

  8. #8
    Boolit Man

    rockydoc's Avatar
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    I am planning to use a Lee .277-135 RF paper patched for my 7X57 Mauser Winchester Model 70. I need my patched bullet to be .279. I tried to size down Lee 285-130 RF cast in 30/1 lead/tin and even after easily sizing as cast down to .285, the next step down to .279 was too much. The new mold comes in tomorrow....to be continued...
    NRA Lifetime member since 1956, NRA Endowment Member. Reloading since 1954. CBA Member Navy Vietnam Veteran USS Intrepid CVA 11

  9. #9
    Boolit Master brstevns's Avatar
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    Quote Originally Posted by rockydoc View Post
    I am planning to use a Lee .277-135 RF paper patched for my 7X57 Mauser Winchester Model 70. I need my patched bullet to be .279. I tried to size down Lee 285-130 RF cast in 30/1 lead/tin and even after easily sizing as cast down to .285, the next step down to .279 was too much. The new mold comes in tomorrow....to be continued...
    Looking forward to seeing your results

  10. #10
    Boolit Master
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    Mar 2014
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    I have that Lee 277 135. Its been dropping .280 for me so you should be fine.

  11. #11
    Boolit Mold
    Join Date
    May 2019
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    NW Arkansas
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    Used .303 British pulls (174 grain target slugs and 175 grain soft points) paper patched to .324" out of the 8x57 Mauser. They shot well, expanded well, and contrbuted to the jerky supply quite satisfactorily. I think the cannelure was a help in this business.
    Last edited by Optimist; 06-10-2019 at 03:49 PM. Reason: left part out....

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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