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Thread: 257 Roberts & NOE 260-122-FN-AN2

  1. #1
    Boolit Master
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    Apr 2005
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    257 Roberts & NOE 260-122-FN-AN2

    I needed to fireform some 6mm Remington brass to 257 Roberts, so I loaded up 49 rounds (screwed 1 case up) with 2400 and shot 4 foulers and then 3 15 round groups @ 100 yards. 14.5 gr of 2400 was 2.309" with 14 in 1.551, 15 gr of 2400 was 1.801 with 14 in 1.720" and 15.5 gr of 24 was 1.594 with 14 in 1.171". There was no cleaning between the groups.......I'll neck size these cases and retry.Click image for larger version. 

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    "Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut." - Ernest Hemingway

  2. #2
    Boolit Bub
    Join Date
    Jan 2008
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    middle Tenn.
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    Please continue with load development for cast loads in the Roberts. I have a Ruger Hawkeye Roberts and a few 100 gr. gas check bullets that I need to start on. I'd like to know where your project leads.

    Thanks

  3. #3
    Boolit Master
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    Tried some neck sized cases last evening....results as follows for 10 shot groups @ 100 yards
    Group 1......14.5 gr of 2400......1.584" with 9 in 1.026"

    Group 2......15.0 gr of 2400......1.368" with 9 in .877"


    Group 3.....15.5 gr of 2400......1.308" with 9 in .995"



    Group 4....16.0 gr of 2400......1.572" with 9 in 1.353"


    Next will concentrate on the 15 and 15.5 loads, paying more attention to quality control and bench technique.
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    "Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut." - Ernest Hemingway

  4. #4
    Boolit Master Idaho Mule's Avatar
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    Just out of curiosity, is "the flyer" your first shot in each group? JW

  5. #5
    Boolit Master
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    Quote Originally Posted by Idaho Mule View Post
    Just out of curiosity, is "the flyer" your first shot in each group? JW
    Nope...………...
    "Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut." - Ernest Hemingway

  6. #6
    Boolit Buddy
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    Apr 2013
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    Upstate NY
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    I'm interested. What alloy and lube are you using?

    I've got an old Savage in 257 Rob Ackley Improved that I've been tinkering with. I can get about 10 shots sub-moa but then it opens up to ~2"groups after that. It does this consistently. That's with a 257312GC (93grs), the old Lyman lube, and probably an alloy that's too soft (2:1 COWW to soft lead, water quenched). Shooting more or less the same load (15'ish grs Alliant 2400 at 1800-1950fps).

    I also have a NOE 260-116RN that I haven't used much--only tried a surplus powder similar to SR4759, and it shot inside an inch at 50.


    We also have an old Rem 722 in 257Rob that I need to get up to speed.

  7. #7
    Boolit Master



    missionary5155's Avatar
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    Greetings 30CalTy
    Is your barrel getting hot around shot #10 ? Hot barrels can mess with lube.
    Mike in Peru
    "Come unto Me, all you who labor and are heavy burdened, and I will give you rest." Matthew 11:28
    Home built Matchlock similar to what an early 1600 Colonial soldier might have.

  8. #8
    Boolit Master
    Join Date
    Apr 2005
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    I'm using LBT blue lube that I have to apply using a heated sizer. NOE specs the mold with wheel weights @ 122 grains, my alloy casts @ 118 grains.
    "Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut." - Ernest Hemingway

  9. #9
    Boolit Buddy
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    Quote Originally Posted by missionary5155 View Post
    Greetings 30CalTy
    Is your barrel getting hot around shot #10 ? Hot barrels can mess with lube.
    Mike in Peru
    Mike, thanks for the response

    The last round I went with it was in March with temps between 35 and 40F (I think that's around 7C). 5 shots and then a long slow trudge through the knee deep snow that was still hanging around. The barrel was only running around 100F (50-55C? I'm trying to do the math in my head). AND I got the same results--one good, tight 5 rd group inside a minute, and then three at 2-3 minutes--with PC'd GC bullets, on 3 different days. 20-25rds, then cleaned the barrel each time I got home.

    I need to do better at keeping data--I was getting much more consistent results a year or two back with lubed GC bullets. I need to reset, go to a stiffer alloy and a good rifle bullet lube and start over I guess.

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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