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Which gauge for 300 BLK?

Discussion in 'Handloading and Reloading' started by PO2Hammer, Nov 28, 2022.

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  1. PO2Hammer

    PO2Hammer Member

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    Loading 300 Blackout for a Rem 700.
    Would like a gauge that measures spent brass and completed rounds.
    Limited budget, so I want just one.
    ‘Tis’ the season for savings, so I’m ordering soon.
    Please recommend.
     
  2. mcb

    mcb Member

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  3. Varminterror

    Varminterror Member

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    What dimension(s) are you wanting to measure?

    If saving money is the objective, then I just wouldn’t waste any money on any gauge at all.
     
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  4. Englishmn

    Englishmn Member

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    Don't know why you would need a gauge for fired brass?
    You could check it after resizing before loading but that would be the same min chamber gauge.

    I use the lyman msr ammo checker block
    since I have half of those calibers.
     
  5. PO2Hammer

    PO2Hammer Member

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    Would like to measure head space on fired rounds and compare that to my sized rounds to see how much I am moving the shoulder back when re sizing.
    Trying to decide between the type that fits on the calipers or the cartridge gauge.
     
  6. AJC1

    AJC1 Member

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    The Guage doesn't do that in most cases, a caliper mounted comparator would work or an rcbs precision mic if they make one for that cartridge.
     
  7. AJC1

    AJC1 Member

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  8. JSneezy

    JSneezy Member

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    It sounds like you're looking for a headspace comparator more than anything. I have an LE Wilson case gauge for 300BLK, but it won't tell you if you're bumping the shoulder. The directions for it mention using it for fired brass, so it won't do much for sized brass. The Lyman is supposed to be a SAAMI minimum gauge, but again, I don't think it's going to tell you much of what you're looking for. Those are more for checking to see that headspace and trim length are both within SAAMI spec. Only a caliper with a headspace comparator will tell you how far you're bumping.
     
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  9. Walkalong

    Walkalong Moderator Staff Member

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    You can do that with a case gauge and a dial caliper or depth gauge, or you can do that with a caliper and the various tools sold for that.
    Although technically we aren't measuring headspace when we do this. We are measuring shoulder position fired vs sized.

    What do you have on hand that may work?

    My home made gauge for 300 BLK, although I also have a
    Sheridan non slotted case gauge.
    300 Blackout Shoulder Gauge Pic 3.JPG
    300 Blackout Shoulder Gauge Pic 7.JPG
     

    Attached Files:

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  10. PO2Hammer

    PO2Hammer Member

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    All I have is a caliper.
    On a tight budget, but I can afford one tool.
     
  11. JSneezy

    JSneezy Member

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    https://www.midwayusa.com/product/1012743827?pid=479704

    This would be the route I would suggest. I think the sale is still on til sometime later tonight. It usually runs about $50 or so from Sportsman's Warehouse if you have one nearby. I think Midway is still doing free shipping on $49+ orders too.
     
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  12. PO2Hammer

    PO2Hammer Member

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    Ordered a datum gauge from Forster, works like Walkalong’s home made gauge, and was on sale.
    Thanks all.
     
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  13. AJC1

    AJC1 Member

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    I agree that's what I have. Sinclair also make something very similar
     
  14. dannyd

    dannyd Member

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  15. Blue68f100

    Blue68f100 Member

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    You can do it old school. I think a 40 cal brass will contact the shoulder area. Use it for a base then take another reading after sizing and compare the 2.
     
  16. rg1

    rg1 Member

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    Hornady’s Headspace Gauge Set. Inexpensive, works with your calipers, can be used for most other calibers as well. It’s a comparator only.
     
  17. cfullgraf

    cfullgraf Member

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    Most case gauges such as L.E.Wilson or Dillon measure only overall length and shoulder position. They are cut generously in the body dimensions. Hence, cases may pass the gauge check but fail the chamber check.

    Sheridan has case gauges that are cut to SAAMI specs and can be used as "Chamber" gauges--to a point.

    The best chamber gauges are made using the same reamer that made the original chamber.

    Walkalong's suggestions are good "work-a-arounds" with minimal measuring gear needed.

    I'm not a "bench rest" type shooter or competition rifle shooter so I have not seen the use for case gauges. If the case chamberes in my rifle, its good to go.

    But, if doing extra checking on you ammunition makes you feel better about your reloads, go for it. One cannot discount the psychological factor.

    Side note, I race sports cars. You'd be amazed at my pre-session routine getting ready to go out onto the track.:)
     
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  18. PO2Hammer

    PO2Hammer Member

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    Yup, USS Reasoner FF 1063.
    Read that it was sold to the Turks, then was sent to the bottom as a target ship.
    Was my home for 4 years.
     
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  19. markr6754

    markr6754 Member

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    Had a buddy on the USS Badger - DE-1071. Yes, DE to me. As a bubblehead, I could give a FF. A target is a target.
     
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  20. AJC1

    AJC1 Member

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    I believe that the Sheridan Guage is a minimum chamber Guage. As far as I know zero reloaders deal in Sammi ammunition standards as far as sizing goes. We get a hodge podge using some of this one and some of that one. Trim length and oal are some we use from the ammunition side of the drawing.
     
  21. redcon1

    redcon1 Member

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    The slotted Sheridan gauge is the way to go as far as gauges go. That's a nice gauge. I have it for 300 BLK. In the future, any gauge I purchase will be a Sheridan slotted gauge but I already have gauges from other manufacturers for everything else I shoot. The JP enterprises min spec gauge is good too but it isn't slotted and isn't available in 300 BLK. The Hornady comparators are good for measuring cases after firing (or before). The min spec Sheridan gauge is used to make sure your resized rounds are back to SAAMI min spec so you can be confident they will chamber in any rifle of the given caliber and they're especially useful for reloading for semi-auto firearms and/or when using military brass and/or when you're checking a lot of resized cases. Plunk, plunk, plunk, plunk, plunk... I think if I had to pick one or the other, if I was loading for a bolt gun, I'd pick the comparator and if I was loading large volumes of ammunition for a semi auto, I'd pick the gauge but, ultimately, I'd buy them both because they're both useful.
     
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  22. AJC1

    AJC1 Member

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    I believe this to be misleading at best and outright false at worst. There is no reference to which Sammi spec and one is left to believe it's the ammunition spec which is false....
     
  23. redcon1

    redcon1 Member

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    I'm not sure what you mean. This is what Sheridan has to say about their gauge: AMMUNITION GAUGES are uniquely designed to check loaded ammunition, giving you the ability to check your factory ammunition or reloads against a spec chamber. The gauge is machined to the SAAMI minimum chamber spec for the 300BLK caliber. This allows you to check brass sizing, headspace, bullet seating, and crimping all with one gauge. Stainless Steel construction. These gauges are designed primarily for use where the brass is always full length resized. Please see our FAQ for details.
     
  24. AJC1

    AJC1 Member

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    That writeup clearly states chamber spec, which removes any ambiguity. That clearly means your brass or sizing is not in Sammi spec.
     
  25. redcon1

    redcon1 Member

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    It says: The gauge is machined to the SAAMI minimum chamber spec for the 300BLK caliber. That seems pretty unequivocal. The JP enterprises gauge is similarly cut to min spec. This is what JP enterprises has to say about their min spec gauge:
    JP Semi-Auto Case Gauges
    If it fits, it shoots.

    Our case gauge has been the go-to tool for gas gun shooters and reloaders for nearly twenty years. That's because we recognized that gas-operated rifles need a "special diet" when it comes to ammo. Unlike a bolt gun, your AR won't reliably function with a cartridge just because it fits a standard gauge. Plenty of frustrating and badly timed malfunctions trace right back to this problem.

    This is the only case gauge on the market specifically calibrated to meet the needs of the semi-auto rifle shooter. If a cartridge would not fit a minimum-depth SAAMI chamber, this gauge will catch them. Anything that fits this case gauge, you can consider factory-equivalent ammo.

    In this second generation model, we've switched from aluminum to 416 stainless steel for greater wear resistance and longevity. In doing so, we've also significantly improved our tolerances. Side by side, these new gauges catch problem cases even the previous generation wouldn't.

    Shoot with confidence that your ammo will never fail you. We won't let it.


    So if your ammunition will fit a minimum SAAMI spec gauge, you can be confident that they will fit a minimum saami spec chamber. That's why I buy these gauges-for that peace of mind. Am I missing something?
     
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