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What difference will .001" make ?

Discussion in 'Reloading' started by Baddog0302, Sep 3, 2017.

  1. Baddog0302

    Baddog0302

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    Looking at the plated, and coated bullets in 9 MM I notice some of the plated come .355 while others show .356 while the coated show the same .355 and .356 and others say they offer the option; .355 th .357.
    Most 9 mm shooting is done at 25 yds or less, so .001 shouldn't make much if any difference, but if you have noticed any difference an inquiring mind would like to know :headscratch:
     
  2. fredj338

    fredj338

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    In a word, yes, it makes a diff. Undersized bullets dont stabilize well, regardless of bullet type. A lead bullet or coated lead, needs a bit more grip in the rifling to gain the necessary traction for good stability. I shoot 0.357" plated or coated, 0.356" would be a true minimum size, especially in a glock oem bbl.
     
    Last edited: Sep 3, 2017
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  3. DWARREN123

    DWARREN123 Grumpy Old Guy Silver Member

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    Depends on bore size, some sizes work better in some firearms.
    Need to try them to see which size works best for your firearms or check bore size.
     
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  4. WeeWilly

    WeeWilly

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    Anything important has already been said.

    You might search on youtube for videos on how to slug your bore. This will tell you what your bore size is and then you can decide on what diameter bullet within the different bullet type options will best meet your needs. Be prepared to be shocked at the results.
     
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  5. MO Fugga

    MO Fugga Malt Liqra® Lifetime Member

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    Yep. Slug it.
     
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  6. sig357fan

    sig357fan

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    +1
     
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  7. sciolist

    sciolist

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    When I was testing .356 vs .357 plated 147gr for practice ammo, the .357 ran a little faster in my OE G34 barrels. The difference was about 1 PF in the 130 PF range with WST and n320.

    I could not see any difference in accuracy or printing. I've never slugged any of my barrels, so can't comment on the relationship between actual bore diameter and nominal bullet diameter.
     
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  8. fredj338

    fredj338

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    Try 0.355", see how accuracy goes.
     
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  9. sciolist

    sciolist

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    Treacherous old lizard wants to see me shoot some nice 12 inch groups. :p
     
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  10. Ricky baby

    Ricky baby

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    Slugged my g34.4 barrel at .356, good to know. Used a 10mm cast bullet to get the job done.
     
  11. WeeWilly

    WeeWilly

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    I had a Beretta 92FS it slugged at .357". I was my best all time 9mm at longer ranges using .355" jacketed, but for lead, it took .358" or .359 or accuracy was poor and leading a mess.
     
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  12. ROGER4314

    ROGER4314 Friends Call Me "Flash"

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    Try using a Cerrosafe type alloy to "slug" your bore. It's a lot easier. The alloy melts at about 170 degrees, shrinks after casting to ease removal, then expands to the true dimension.

    CerroSafe is a bit expensive, but RotoMetals has their version of it for a lot less. Here's the link to the Rotometals product with full instructions for chamber casting.

    https://www.rotometals.com/chamber-casting-alloy-ingot/

    I've used this alloy many times and found it very useful in measuring the bore sizes of Mosin Nagant rifles. I measure the muzzle end. After installing a paper plug in the muzzle end, pour the alloy in the muzzle. Remember, you're on the clock!

    Flash
     
    Last edited: Sep 4, 2017
  13. willie_pete

    willie_pete NRA Life Member

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    Yep, I melt in in a pot of boiling water. Just read the directions; there is only a certain time you can take an accurate measurement.

    wp
     
  14. fredj338

    fredj338

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    I will dmit to never slugging a bore. I have mulitple guns in each caliber & not going to put custom sized bullets in them all. With revos, even more of an issue because you have cyl throats too. I have settled on 0.357" for all my lead/coated lead in 9mm. For 40, 0.401" has worked so far, 0.452" in 45acp & 0.431" in 44mag, 0.358" in 357mag. If i find i need a larger bullet for one, they all get the larger bullet. So bigger is better, yes yor wife/girlfriend is right about that.
     
    Last edited: Sep 5, 2017
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  15. HAMMERHEAD

    HAMMERHEAD

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    I've found polygonal (HK & Glock) barrels to be pretty tolerant of bullet size. Never had leading or heavy fouling regardless of bullet size or coating. In 357 I've had good luck with .355" and .356" plated and jacketed, but lead and coated need to be .358".
     
  16. fredj338

    fredj338

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    So how is 0.358" "tolerant" of bullet size? If anything, poly bbls want bigger bullets for a better seal.