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Thread: PC and Chamber Pressure

  1. #1
    Boolit Buddy
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    PC and Chamber Pressure

    Has anyone seen any information on how PC effects chamber pressures? Higher, lower or not at all?
    Thanks

  2. #2
    Boolit Master
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    Have not seen any change in pressure with powder coated bullets. I load at low range of powder charges on the hand guns. Have never loaded at the upper range of powder charges.

  3. #3
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    Smoke4320's Avatar
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    very few people here have actual chamber pressure measuring equipment
    I think Larry Gibson may be the only one
    you might ask him via PM if he has tested this..
    I would be interested in the results as well
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  4. #4
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    Lloyd Smale's Avatar
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    Velocity runs a bit less with pc then the same bullet and load conventionaly lubed so id have to guess pressures are slightly higher due to friction. My pc loads run about the same speed as jackted bullets the same weight so id say although it might increase slightly loading data in the reloading manuals is safe.
    Soldier of God, sixgun junky, Retired electrical lineman. My office was a 100 feet in the air, closer to God the better

  5. #5
    Boolit Master
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    I would like to see more on this also

  6. #6
    Boolit Master
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    Quote Originally Posted by Lloyd Smale View Post
    Velocity runs a bit less with pc then the same bullet and load conventionaly lubed so id have to guess pressures are slightly higher due to friction. My pc loads run about the same speed as jackted bullets the same weight so id say although it might increase slightly loading data in the reloading manuals is safe.
    My experience has been a little different. When compared to Lyman manual for gas guns, paced bullets run from 150 to 350 FPS faster than listed velocities when checked with an inexpensive chronicle chronograph. Velocities pretty well match when using Jacked bullets. From an engineering point of view the grind of the powder and its color componits could have an impact but from performance impact is very little.

  7. #7
    Boolit Master Forrest r's Avatar
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    [IMG][/IMG]

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    For me the pc'd bullets have always been faster. Same bullet cast from the same alloy/same time.
    PC VS Traditional lube ='s pc is faster with fast burning pistol powders and rifle powders

  8. #8
    Boolit Master fredj338's Avatar
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    At pistol pressures, I don't think there is much variation. My PC bullets will run about 20fps faster than lubed lead. Well within std deviation with most powders.
    EVERY GOOD SHOOTER NEEDS TO BE A HANDLOADER.
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  9. #9
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    Generally PC'ed bullets should run about 4% faster.. Less friction not more.
    One of the reasons you have to start over . you cant just take a lubed load and sub a pc bullet and expect the same group
    Barrel harmonics will be different
    I carry a Nuke50 because cleaning up the mess is Silly !!

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  10. #10
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    Lloyd Smale's Avatar
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    I guess im wrong. I was just going by what I was told on here back when I started using pc. that and my 9mm testing showed velocitys about identical to my jacketed loads which run a bit slower then convetionaly lubed cast bullets. I never did chrono the same bullet and load conventionaly lubed and pc'd. I guess I need to break out the chrono and try it. I do know that comparing the same load with pc and coventionaly lubed versions of the same bullet does effect groups. Sometimes by quite a bit.
    Soldier of God, sixgun junky, Retired electrical lineman. My office was a 100 feet in the air, closer to God the better

  11. #11
    Boolit Master
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    The only significant testing I have done is with handgun loads. My chronographed loads indicate about a 5% increase in velocity, so Smoke is right as far a percentage of increase in PC velocity.

    Federal has the means and has done a lot more testing on Polymer Jacketed bullets. Federal says PC is a superior lubricant creating less friction; this can be substantiated by cooler barrel measurements.

    As long as one is observing safe loading practices I wouldn't lose any sleep worrying about overpressure PC loads.

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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