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Forster CO-AX Case Cartridge Inspector Instructions Manual

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    CO-AX®CASE AND CARTRIDGE INSPECTOR INSTRUCTIONS
    Improve your shooting accuracy by fine-tuning your cases and cartridges. Bench rest shooters, sharp shooters, varmint
    hunters and all types of marksmen, for that matter, expend effort to make their cartridge cases consistent. The Inspector will
    handle from .22 caliber to 45-70 cartridges. The Inspector is unique in that it supports the work in a manner which checks
    bullet and case alignment in relation to the centerline (axis) of the cartridge. This precision instrument makes three impor-
    tant measurements of cases and loaded ammo. The Co-Ax
    ®Case Inspector measures these “accuracy-critical” dimensions:
    1) Case neck wall thickness; 2) Case neck runout (concentricity); and 3) Bullet and cartridge runout of loaded rounds.
    Accuracy Checks 1 and 2 require the use of the proper-sized pilot that fits the inside diameter of the case neck closely.
    To find which pilots are right for you, visit our online search database at www
    .forsterproducts.com.(Click on the “Parts
    Search” button in the top right navigation tabs.)
    Variant readings received from the Inspector’s Accuracy Checks 1 and 2 may suggest the need for you to size cases
    again or to outside neck turn. Unacceptable results from Accuracy Check 3 indicate the need to improve your bullet seat-
    ing operation. Forster offers complete solutions for all these case and cartridge improvements.
    FIGUREA
    Head
    BodyShoulder
    Base
    RimExtractor
    GroovePoint of 
    Support
    BulletPoint of 
    Support NeckMouth
    DESCRIPTIONPART #
    BASE010482-011
    B
    RACKET010482-012
    M
    AINLOCKNUT010482-013
    K
    NURLEDLOCKNUT010482-014
    S
    TOPBAR/PILOTSUPPORT010482-015
    V- B
    RACKET010482-016
    V- B
    RACKETSCREWS(2) 010482-020
    R.H. S
    TOPPIN010482-017
    S
    PRING010482-018
    C
    LIP FORSTOPPIN010482-0181
    L
    ARGEWINGNUT010482-021
    S
    MALLWINGNUT010482-022
    D
    IALINDICATOR010482-028
    8-32 S
    ETSCREWCT1010-015
    Stop Bar/
    Pilot SupportIndicator 
    Point
    Pilot 1/16” 
    Clearance
    FIGUREB
    Indicator Spindle
    Dial Lock
    Markers
    Pointer Tip
    Dial
    Indicator
    Ball Point
    014
    012013
    0181
    018
    017
    016
    020
    015
    021 022
    011
    FIGUREC
    CT1010-015
    DIALINDICATOR(REFERTOFIGUREB)
    This indicator is accurate to ± .001 inches, and has a travel of 1/2”. The larger pointer reads from zero to .100 inches,
    the smaller pointer reads from zero to .500 inches.
    The face of the outer dial may be turned to “zero out” the larger pointer. Simply loosen the dial lock on the indicator, then
    rotate the dial to align the zero mark with the pointer tip.
    On the Inspector, the dial indicator is mounted to the bracket with two lock nuts. The bracket allows the indicator to be
    moved in a variety of positions for different-sized cases and cartridges.
    Page 1 
    						
    							CRITICALACCURACYCHECK1 — CASENECKWALLTHICKNESS
    Due to variations in case manufacturing, uneven neck walls do occur. The same uneven neck wall phenomenon occurs
    after brass has flowed unevenly after repeated firings. Cases should be cleaned first to ensure accurate readings. Use a
    cleaning brush to remove any powder residue from the inside diameter of the neck. Your Case Inspector provides a far
    more accurate check than that obtained with a dial caliper, which cannot properly measure round objects.
    Select the proper pilot and fasten it in the stop bar/pilot support as per Figure C. The stop bar/pilot support should now
    have its pilot facing the V-block of the base. Adjust the stop bar/pilot support with adequate clearance for the case to be
    slipped on and off the pilot. The V-block on the red base does not have to be used for this inspection process. Lock the
    stop bar/pilot support in place with the large wing nut (#010482-021).
    Adjust the dial indicator’s point to read on the flat part of the pilot. It should rest on the pilot and be slightly compressed.
    Be sure that the ball point of the indicator is touching only the pilot. (See Photo 1.) Next, “zero out” the indicator. Simply
    loosen the dial lock located at the two o’clock position on the body of the indicator, then rotate the dial to line up the zero
    mark with the pointer tip.
    Now you are ready to slip the case neck between the pilot and indicator to take a direct measurement of neck wall thick-
    ness. It is easiest to lift the ball point with one hand, then slide the case mouth onto the pilot and up against the stop
    bar/pilot support. Lower the ball point slowly into contact with the case. The reading on the dial is the thickness of the case
    neck at that point.
    Use a Magic Marker to notate the point of your first reading, then take four or five more measurements around the case
    neck. If there is a variation of .0015” or greater, resize your cases and recheck the neck wall thickness. If resizing does not
    correct the variation, use a Forster Outside Neck Turner in conjunction with the Forster Case Trimmer.  
    CRITICALACCURACYCHECK2 — CASERUNOUT
    This concentricity check is set up by positioning the stop bar so that the V-bracket is supporting the neck of the case.
    Loosen the two screws of the V-bracket, so that it may be adjusted up and down. Adjust the V-bracket so the case is held
    level/parallel to the base. Tighten the two screws. Place the ball point of the indicator so it is touching the case about 1/8”
    from the shoulder. Rotate the case as in Accuracy Check 1. If variation of greater than .0015” to .002” is registered, you
    will want to look for ways to make the cases more consistent.
    PHOTO1PHOTO2
    CRITICALACCURACYCHECK3 — BULLET ANDCARTRIDGERUNOUT OFLOADEDROUNDS
    Bullets will not leave a rifle barrel at a uniform angle unless they are started uniformly. The Forster Cartridge Inspector
    will give a reading of how closely the axis of the bullet corresponds with the axis of the cartridge case. The Inspector is
    unique in that it supports the work in a manner which checks bullet and case alignment in relation to the centerline (axis)
    of the cartridge. Ammunition with approximately the same axis may be selected and used for precision shooting. A spring-
    loaded plunger holds the cartridge against the stop bar while the case and the bullet are supported in V-blocks. Rotating
    the cartridge with your fingers transfers the degree of misalignment to the indicator. The sensitive dial indicator is gradu-
    ated in thousandth-of-an-inch increments, but may easily be read in one-half-thousandths.
    To check the concentricity of a completed cartridge round, set the Inspector up as shown in Photo 2 above. For most accu-
    rate readings, it is best to support the case just in front of the rim. See Figure A on Page 1 for proper contact points of support.
    Adjust the (bullet end) V-bracket so that the cartridge is level. Adjust the indicator so that it just touches the bullet about 1/8” from
    the case mouth. “Zero out” the dial if you so desire. Rotate the case while pressing downward with a continual, even pressure.
    Our goal is runout of .000” to .002”. Concentricity of .002” to .004” is adequate for some varmint and long-range shoot-
    ing. If you detect bullet runout of more than .004”, you should determine the cause. First, check the case neck walls for
    consistency and the possible need to outside neck turn. If the necks are OK, you should look into the improvements that
    you can gain with the use of our Bench Rest
    ®Straight Line Seater Dies.  
    Thank you for purchasing a Forster Precision Product. Please wear safety glasses.
    Forster Catalogs are available upon request.
    010482-005     Rev. 2
    Page 2 
    						
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