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Thread: Dummy rounds

  1. #1
    Boolit Buddy Krh1326's Avatar
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    Dummy rounds

    If you have a tough feeding , platform ( in my case Iím playing with an AR in 300 Blk ) and you are experimenting with different boolits, col , etcÖ can the empty case of your dummy round, contribute to what is going on, at nose of boolit, during feeding? If a nose heavy boolit is having an inconsistent feed at the ramps, would adding the ballast , of the equivalent of primer and your intended charge help?
    I donít like the idea of a live primer and powder during blatant feed and cycle, especially while working on a problematic combination. Would a spent primer installed, and maybe the equivalent powder weight in maybe some cured hot glue beadsÖ make any kind of difference?

  2. #2
    Boolit Master 44Blam's Avatar
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    So, comparatively, the primer/powder weight is pretty low compared to the boolit weight. Personally, I just have a boolit and a case and I seat/crimp as I would when loading them. If I booger up a boolit, I use a new one and put the boogered one back in the pot. No fuss.
    WWG1WGA

  3. #3
    Boolit Buddy
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    Spent primer and the same weight in grains of walnut shell/ corn grits/ abrasive media as your powder should do the trick.

    Also there are 300blk specific mags that are slightly different from 223 mags. You may notice a difference.


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  4. #4
    Boolit Buddy Krh1326's Avatar
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    I get that the weight is nothing like the boolit, but just trying to think… could it be any help, in helping that nose go up, instead of dig down.

    Yes different mag… to my eye, it looks like ribs in sides of mag are trimmed back further, than in 223/556 mag.

  5. #5
    Boolit Buddy
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    What boolit are you trying to get cycling?


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  6. #6
    Boolit Master mehavey's Avatar
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    If you have feeding problems because powder weight isn't accounted for,
    you still have feeding problems no matter what.

    As asked above: what bullet, what nose design, what OAL?

  7. #7
    Boolit Buddy Krh1326's Avatar
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    Quote Originally Posted by johnsonian09 View Post
    What boolit are you trying to get cycling?


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    https://www.mp-molds.com/product/mp-...g-hp-gc-4-cav/

    Same one in our group buys, that people were raving about. It’s on 3rd run.
    I got my hands on one, from ePay.

    Best feed I have so far, is in top of lube groove. Crimped in the lube groove , set in shoulder closest to nose.

    Click image for larger version. 

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    Last edited by Krh1326; 08-10-2022 at 10:37 PM.

  8. #8
    Boolit Buddy
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    Dummy rounds

    That looks like a great Winchester or 30-06 bullet.

    Youíll want to look over your barrels feed ramp extension to make sure itís milled for 30cal.

    Some brands still mill a standard m4 5.56 feed ramp on 300blk barrels. Iíve had this issue myself recently.

    Round nose, hp, and flat points have more difficulty cycling.

    Iíve had some success with round nose 30 carbine bullets similar to this but only 100grains. And hollow points with an s2 ogive but any blunter I get some problems.


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  9. #9
    Boolit Buddy Krh1326's Avatar
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    Quote Originally Posted by johnsonian09 View Post
    That looks like a great Winchester or 30-06 bullet.

    You’ll want to look over your barrels feed ramp extension to make sure it’s milled for 30cal.

    Some brands still mill a standard m4 5.56 feed ramp on a 300blk barrels. I’ve had this issue myself recently.

    Round nose, hp, and flat points have more difficulty cycling.

    I’ve had some success with round nose 30 carbine bullets similar to this but only 100grains. And hollow points with an s2 ogive but any blunter I get some problems.


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    It’s a Ruger Model 556 rifle. I’ll have to investigate that, further, tomorrow.. had to walk away from it, for the night. It like it’s right on the line… some will feed then one won’t. Some will feed then one won’t.

  10. #10
    Boolit Master mehavey's Avatar
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    Before you do anything else, try a different/different brand magazine.
    https://www.midwayusa.com/product/1018507080
    Last edited by mehavey; 08-10-2022 at 10:59 PM.

  11. #11
    Boolit Buddy Krh1326's Avatar
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    Quote Originally Posted by mehavey View Post
    Before you do anything else, try a different/different brand magazine.
    https://www.midwayusa.com/product/1018507080
    Pick my lottery numbers! That’s the mag we’re using. Pmag 300blk

    The Lee 312-155 and 309-230 run right through it, nicely. I’m trying to give the kid a decent hunting round, and for the caliber… this boolit I’m working on, screamed try me, try me!

  12. #12
    Boolit Master mehavey's Avatar
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    Try anyone else's just plain old vanilla 5.56 mag then...

  13. #13
    Boolit Buddy
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    Quote Originally Posted by mehavey View Post
    Before you do anything else, try a different/different brand magazine.
    https://www.midwayusa.com/product/1018507080
    I have found buffer wt makes a difference if you gun is over gassed. Slowing down the bolt speed with a heavier buffer gives some follower springs more time to lift of a round.
    Last edited by barnetmill; 08-11-2022 at 12:58 AM.

  14. #14
    Boolit Buddy
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    With my short rn blackouts a 5.56 pmag is more reliable then the 300blk mag. GI mags have zero function. But my Coal is going to be shorter then yours by a fair amount. And that arís action is about as soft as it can get

    Iíve been curious if a redesigned follower that increases the angle of the cartridge might help.


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  15. #15
    Boolit Master


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    Quote Originally Posted by mehavey View Post
    If you have feeding problems because powder weight isn't accounted for,
    you still have feeding problems no matter what.

    As asked above: what bullet, what nose design, what OAL?
    Agreed... If 15-20 grains cause the gun not to feed..work on the gun...

  16. #16
    Boolit Buddy Krh1326's Avatar
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    Good stuff… will go at it again, later, when I get home. I have Pmag gen 3s for my AR… Will give them a go.

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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