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Thread: How large a diameter?

  1. #1
    Boolit Bub jski's Avatar
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    How large a diameter?

    I'm reloading for my .30 Carbine Blackhawk. Of course its diameter is .308. Now, I've been told many times and repeatedly that I should use at least a .309 diameter when using cast bullets. I've also been told many times and repeatedly that I should be able to easily insert the bullet into the forcing cone at the breach of the barrel. The problem is that .309 bullets do not easily fit into the forcing cone, lest I use a hammer.

    So which of the 2 pieces of advice should I go with?

  2. #2
    Boolit Master
    Yodogsandman's Avatar
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    You should pound slug your barrel with a pure lead slug and measure to find out what YOUR barrel measures. The boolits should fit your revolver cylinders tightly. The boolits should be .001"-.002" over YOUR barrels groove diameter and fit tightly in the cylinders.
    A deplorable that votes!

  3. #3
    Boolit Master
    runfiverun's Avatar
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    .310..
    it's all an educated guess,,,, till the trigger is pulled.

    this opinion brought to you by mister low-tech solution..

  4. #4
    Boolit Master

    gwpercle's Avatar
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    The Lyman Manual shows them sized .308 in their data.
    If you have both .308 and .309 try them and see what your gun prefers.

    My 1903-A3 Springfield in 30-06 can't tell the difference, For years I sized them .308 like the old Lyman manual said to. Read how this was sooooo wrong, bought a .309 sizer and guess what , that dumb rifle shot just as well with .308 as with .309. But I gave the .309 a sporting chance, it just didn't perform like "they" said it was going to.
    Gary
    Certified Cajun
    Proud Member of The Basket of Deplorables

  5. #5
    Boolit Bub jski's Avatar
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    With the headspacing at the case mouth and the tightening of the cylinder throats, I was forced to push the .309 bullet deep into the case ... maybe too deep ... to get it to seat properly in the chamber. It would certainly constitute a compression load.

    I used the 50 .309 diameter bullets I had and called Montana Bullet Works and changed my order to .308.

  6. #6
    Boolit Master
    runfiverun's Avatar
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    wow.
    I actually size to....312 for my 30 carbine revolver.
    it's all an educated guess,,,, till the trigger is pulled.

    this opinion brought to you by mister low-tech solution..

  7. #7
    Boolit Mold
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    I size to 0.311" for all my 308 Win's and 300 blk's. I did notice better accuracy over .308 and 309"

    Sent from my SM-T377P using Tapatalk

  8. #8
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    badgeredd's Avatar
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    Quote Originally Posted by jski View Post
    I'm reloading for my .30 Carbine Blackhawk. Of course its diameter is .308. Now, I've been told many times and repeatedly that I should use at least a .309 diameter when using cast bullets. I've also been told many times and repeatedly that I should be able to easily insert the bullet into the forcing cone at the breach of the barrel. The problem is that .309 bullets do not easily fit into the forcing cone, lest I use a hammer.

    So which of the 2 pieces of advice should I go with?
    Perhaps you are misunderstanding what some call the "forcing cone." In reality your bullet should fit the chamber throat in the cylinder. Some Rugers have a tight throat which doesn't allow a cast bullet of adequate diameter to slide into them. Some throats vary in the same cylinder. GENERALLY, a bullet .002" larger than the barrel groove diameter is best, but that is not a hard rule. I have a revolver that has throats that are .005" larger than the groove diamet but I size the bullets of SOFT alloy .002 over the groove diameter. Alloy hardnes and bullet length can also affect what size works best in YOUR gun. I personally would start with a bullet .002" over groove diameter IF it will chamber.
    Last edited by badgeredd; 02-26-2017 at 01:21 PM.
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  9. #9
    Boolit Bub jski's Avatar
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    Badgeredd, I would have needed a hammer to push that .309 bullet thru the cylinder. That can't be the better size v. the .308 !

  10. #10
    Boolit Bub jski's Avatar
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    BTW, this is the beastie in question:

    Click image for larger version. 

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    As you can see it's gas checked and, as you can't see, it has a 22 BHN. I'd like to push the bullet into the case up to but not including the grove. That's not possible with the .309.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check