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Thread: Use of Precision Mic for .325 WSM Win M70 Extreme Weather SS

  1. #1

    Default Use of Precision Mic for .325 WSM Win M70 Extreme Weather SS

    I have reloaded for many years with much success on various calibers but have not been able to finess my load to a consistent state for this rifle. Some days at the range are decent, other days not so much. After suspecting something was amiss with my rifle or my die set, (it couldn't be me) I recently purchased an RCBS Precision Mic to measure the headspace of my rifle and also to use for measuring distance to lands. It was easy to use and functioned flawlessly. I discovered that my .325 WSM chamber was to ANSI standards. I also discovered that my RCBS FL reloading die set was resizing my brass longer than the chamber of my rifle. I since have purchased a Neck Sizing die and will try resizing brass with that. Just need to fireform some brass. I know the FL die can be turned 1/8 to 1/4 of a turn further down and cam over to help neck size, in fact this is what I found was more accurate. Now the Neck sizer die.

    Anyone use the Prescision Mic? Any stories, good or bad? Thanks in advance.

  2. #2
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    with any of the WSM's be sure you lube the inside of the neck when sizing - I really cannot give a succinct explain but in application I found that it solved all my troubles with 325 and 270 WSM's

  3. #3

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    That is very interesting back country, lubing the inside of the neck when sizing...I have read about that but have never tried it.

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    Quote Originally Posted by CHAPS View Post
    That is very interesting back country, lubing the inside of the neck when sizing...I have read about that but have never tried it.
    I've been using this stuff (LINK)for years and once in awhile I add a little additional lube (LINK)to freshen it up. Works great and makes a minimal mess. I've not had issues with the WSMs, but it helps to minimize case stretching/elongation during sizing which helps improve case life and curbs the need to trim as often.
    Foolishness is a moral category, not an intellectual one.

  5. #5

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    Ok, I tested a load today which was meticulously measured and metered and I am still only getting 1.5" groups with this rifle. Maybe it is the rifle. Maybe its just not a shooter.

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    Quote Originally Posted by CHAPS View Post
    Ok, I tested a load today which was meticulously measured and metered and I am still only getting 1.5" groups with this rifle. Maybe it is the rifle. Maybe its just not a shooter.
    What powder are you using? Have you played with COAL at all? With TSX bullets I have found that seating them about as far as the magazine will allow with a max charge works pretty good.

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    Lubing the inside of the case necks is especially important with RCBS dies that have the short expanded button that tends to drag more than the Lee, Hornady etc dies with the longer tapered expander buttons. RCBS even sales some nylon brushes for the purpose.

    I use the Lee water based lube for both the inside case necks and outside of the cases. Since some of the case neck lube may be in contact with the powder an oil based lube isn't recommended unless you plan on completely cleaning the cases after sizing.

    The outfit that makes the pressure measuring equipment apparently has quite a bit of information on case neck tension and its effect on pressure and accuracy. I'll have to dig up the link.

    Quote Originally Posted by CHAPS View Post
    That is very interesting back country, lubing the inside of the neck when sizing...I have read about that but have never tried it.
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  8. #8

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    since reading the input here, I have lubed the inside of the neck with imperial sizing wax and wiped it out afterwards before adding powder. That did not appear to improve my groups.

  9. #9
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    Quote Originally Posted by CHAPS View Post
    since reading the input here, I have lubed the inside of the neck with imperial sizing wax and wiped it out afterwards before adding powder. That did not appear to improve my groups.
    Sir where are you located?? I have done quite a bit of load development for the same rifle you have and if you are near Fairbanks I would be willing to try to help.

    Steve
    "I refuse to let the things I can't do stop me from doing the things I can"
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    http://www.residenthuntersofalaska.org/

  10. #10

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    Stid2677,
    No, I do not live near Fairbanks, but thank you very much for offering your help. I am headed to range tomorrow with another load workup. Trying to lengthen the COAL closer to lands.
    CHAPS

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