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Thread: PPB in gas guns?

  1. #1
    Boolit Bub

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    Question PPB in gas guns?

    Does/has anyone tried PPB's in gas operated guns? I'm thinking in particular of AR's. I recently got a .450 Bushmaster upper and wanted to use cast bullets, but the consensus of those over at 450bushmaster.com is that you have to use gas checks that are at least .10" tall to breach the gas port, or the bullets will gas cut. What are your thoughts or experiences?

  2. #2
    Boolit Master

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    Can not speak for that caliber. I shoot the 6.5 Grendel. Hornady and Gstor gas checks are super short for that cal. I dont have a problem.

    Not sure of paper patching in a gas gun.

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  3. #3
    Boolit Grand Master 303Guy's Avatar
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    My thoughts would be to try it and see.

    The paper patched boolit should be a pretty tight fit in the bore so only once the port starts to open would there be any tendency to gas cut. Is that enough time? Sure, the paper will cut but the alloy? And if a hard enough alloy is used? But even if gas checks are used, that's only one extra step and might improve accuracy by providing a clean, even boolit trailing edge. I would imagine that only the boolit trailing edge would gas cut so the length of the g/c would not be an issue. Am I off the mark?
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  4. #4
    Boolit Buddy Old Coot's Avatar
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    We know that cast bullets cause no problems in gas operated weapons; M1 Garand, M1 Carbine, M1A, and AR's all function well with cast bullets, so why wouldn't a patched bullet work? Unless there is a burr on the inside of the barrel where the gas bleed is the only real problem I see is feeding and keeping the patch in one piece. In other words, the same problem with paper patched bullets in any repeating rifle. Brodie

  5. #5
    Boolit Master Nobade's Avatar
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    Exactly. My M1 shot just fine with PPCBs, but getting them into the chamber undamaged was the challenge. It worked just fine as a single shot but not as a repeater.
    "Quemadmoeum gladis nemeinum occidit, occidentis telum est."

  6. #6
    Boolit Master Harter66's Avatar
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    I shot an SKS with some and did get some piston lead fouling .
    Armed with that the gas port would swollow a .128 #30 drill bit and the groove was .3165 with the port splitting the land on the load side . So basically everything was wrong that could be wrong .
    The rifle was minute of gallon antifreeze bottle at 50 yd with factory 123s the PP 200 gr spitzer eventually made 35 groups at 100 fed from the mag .
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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