Neck question

Discussion in 'Reloading Forum (All Calibers)' started by Shoebox, Apr 20, 2017.

  1. Shoebox

    Shoebox

    Joined:
    Nov 3, 2016
    Messages:
    150
    Neck question

    Chamber neck .2905
    With accuracy in mind !
    On loaded case what OD would be considered optimum,
    Case is 6.5 necked down to 257,
    nosler brass, which is usually consistent, so neck turning should allow me to custom fit
    Neck tolerance,
    "Overbore cartridge" in case that comes into consideration,

    PAC nor super match barrel
    Savage 112 single shot
    Pt&g precision bolt head,

    All replies appreciated
     
  2. Richard Jones

    Richard Jones just glad to be here Gold $$ Contributor

    Joined:
    Jan 11, 2005
    Messages:
    379
    1. Intended purpose? If bench only, I would look for .0015-.002 clearance. For hunting, .002-.003.
    2. Verify chamber dimension.
    3. 'Case is 6.5 necked down to 257,
    nosler brass, which is usually consistent, so neck turning should allow me to custom fit'--------- this doesn't make sense to me. If you turn it, the 'factory consistency' is lost.
    4. Unless your brass is >.016 neck thickness, you'll wind up with at least .0015 clearance without turning.
    5. 'Overbore cartridge', 'PacNor.......'not relevant to your question.

    Maybe I need more coffee......
     
  3. kvd

    kvd Silver $$ Contributor

    Joined:
    Aug 13, 2011
    Messages:
    103
    Most would recommend a minimum neck clearance of 2 thousandths of an inch on each side. With that in mind, if your chamber neck is cut to 0.2905 inch, you should shoot for: 0.2905 - 0.004 = 0.2865 inch for the OD of the loaded round.

    Depending on the thickness of the Nosler brass you mentioned, neck turning may not be necessary because the above OD can be achieved with case neck walls close to 0.015 inch thick (0.01475").

    Ken
     
    dmoran likes this.
  4. dkhunt14

    dkhunt14

    Joined:
    Jan 15, 2012
    Messages:
    4,333
    I prefer a minimum of .003. Some guns like a little more. Matt
     
    seymour fish and dmoran like this.
  5. Shoebox

    Shoebox

    Joined:
    Nov 3, 2016
    Messages:
    150
    Kvd & dkhunt14
    Thank you for your replies I appreciate you effort!!

    thank you !!
     
  6. Shoebox

    Shoebox

    Joined:
    Nov 3, 2016
    Messages:
    150
    Richard Jones
    Intended purpose accurate hunting rifle,
    LTR Description Date
    A 25 Nosler 7/21/2014























    TPI in 20 Inches
    Body TPI 0.112
    Neck TPI 0
    Throat TPI 0.5237
    Pilot Size 0.2498
    Caliber 6.5mm
    Bore Size 0.25
    Groove Size 0.257
    Basic Brass Nosler
    Resize N.D.
    Margin 0.001
    MAT'L.
    PACIFIC TOOL DWG. BY Dave Kiff
    ± .001 598 Avenue C Checked
    + 0.0004 White City, OR 97503 Approved
    ± 1/4 (541)826-5808 Sheet Jasmine
    + .005 Print# 58347
    N
    Richard tried to paste print but this is all I got, 26 nosler necked down to 257
    I mentioned overbore in case higher volume required more clearance , I mentioned nosler being consistent in case it was a simple .002 cut to achieved required result,
    This is the part that concerned,

    . Unless your brass is >.016 neck thickness, you'll wind up with at least .0015 clearance without turning.
    Didn't want to neck down and "Hope" all was good !
    Sorry I didn't state question more technically
    Thank you for your time and effort !!
     
  7. Richard Jones

    Richard Jones just glad to be here Gold $$ Contributor

    Joined:
    Jan 11, 2005
    Messages:
    379
    If I had a real hot round, I would sure check it after every firing as far as length goes. Running already overbore stuff really hot leaves little margin for error.

    How thick is the neck after you step it down? Are you going to have to turn the necks or can you leave it?
     
  8. Shoebox

    Shoebox

    Joined:
    Nov 3, 2016
    Messages:
    150
    Richard
    26 nosler case 2.590
    25/26 nosler 2.600
    Until I neck down a few to get accurate over all length and neck thickness I am unable to answer,
    I have ordered barrel, but have long lead time, looking at 6/months
    Dies are a bit of question was going to get Redding type S match , seater, body, & neck.
    Now looking at type S full length die set
    For hunting full length resizing may have its advantages
    Do you see any advantage of one over the other ?
    Only ever reloaded for my 2506ai standard rcbs dies
    And yes I will be keeping an eye on case stretch !!

    Thanks for the thought !!
     
  9. dkhunt14

    dkhunt14

    Joined:
    Jan 15, 2012
    Messages:
    4,333
    When you neck down the brass typically gets .001 thicker. At least on all the cartridges I played with. I wouldn't spend the money for match dies for that cartridge. It wouldn't help you any. You will have to neck turn them. I think your neck diameter for reamer is off. I have a tight neck reamer for a 6.5-284 and it is .290 neck. I would talk to the reamer maker. Matt
     
  10. Shoebox

    Shoebox

    Joined:
    Nov 3, 2016
    Messages:
    150
    Matt
    PAC nor prefit print 2.905 4 grove 1-11tw only going to run ttsx 80-100 which ever is most accurate, had good results with both in 2506ai settle for 80s better accuracy !!
    Main quarry pigs,goats,deer,wild dogs,
    Short range 400 - 500 yds max
    Both bullets worked well at these ranges
    Steve
     
  11. Shoebox

    Shoebox

    Joined:
    Nov 3, 2016
    Messages:
    150
    Matt been thinking about
    Throat 2905
    .2905 -
    .257 = 335÷ 2 = .01675
    Could this be a no turn neck, neck thickness 16thou would .0015 clearance as stated earlier buy Richard.
    This is all new to me !
    PS 26 nosler .015 on friend nosler cases which should give me .00175
    Could you boys go over my math
    Now I need a coffee!!
    Steve
     
    Last edited: Apr 21, 2017
  12. Shoebox

    Shoebox

    Joined:
    Nov 3, 2016
    Messages:
    150
    Guess who didn't add .001 for necking down :eek::mad:
     
  13. dkhunt14

    dkhunt14

    Joined:
    Jan 15, 2012
    Messages:
    4,333
    .001 per side, at least that is what mine gained in the cases I necked down. Never saw perfect brass, it usually varies at least .005 from thick to thin, but it can be .001 or more. Matt
     
    Last edited: Apr 21, 2017

Share This Page