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Thread: Testing Propellants Effect On Bullet Coatings

  1. #21
    Boolit Bub
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    This will help with powder containing nitroglycerin and other information. http://www.ilrc.ucf.edu/powders/samp...p?powder_id=36

  2. #22
    Boolit Master GunFun's Avatar
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    Thanks Joe K.

    So far every powder I have checked other than IMR 4227 lists nitroglycerin as the main component. Including leverevolution which is supposed to be nearly the same as CFE223
    In the market for a multicavity Mi-Hec 9mm HP mold.

    I presently cast for .380 ACP, 9mm, .38/.357, 30 cal and .45 and 12 Ga slug.
    I am particularly grateful for the help I have gotten from members Red333 and MSRdiver, and OLD Para (who made a crazy mold on my design!!!!!) as well as excellent guides by Recluse for his ideal lube process. I have been experimenting with poly coating too.

    PM me if you know of a very cheap source of birdshot, or an efficient way to make #4 Buck.

  3. #23
    Boolit Master rsrocket1's Avatar
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    I started my test in November of 2015. Maybe it's time to check them again. My concern was also more about the effects of the powder than on the base of the bullet. If worst comes to worst, you have essentially a bare based bullet, so a gloppy coating will do almost nothing to affect the accuracy. However if 10% of the powder loses some effectiveness due to interacting with the polymer, that could be bad. If 10% of the powder loses 25% of its efficiency, then you are down by only 2.5% which is not bad. It's likely that only the powder in direct contact with the polymer might be affected which is much less than 1%.

    Here was a picture after 50 days. I do need to update the original post to link to something other than Photobucket and also do a 30 month update. They are still sitting face down with the powder against the bullets.



    There is a website that gives the spectral content of a huge number of powders. It was performed by or for the FBI when they thought they could determine the type of powder used in a shooting by comparing its residual composition and matching it with it's database. Very interesting stuff which can also be used to guess as to how much NG there is in the powder. A large number of rifle and pistol powders were analyzed.

    I also read some papers on the effects of NG heart medication on polymer IV drip bags. Apparently it does affect the polymer but I don't know if it affects the medication.


    Here is the database.
    There are often several spectral graphs per powder so try to get ones with the same Y-Axis and you can see the different NG contents of various powders. Pretty interesting stuff if you're into it.

  4. #24
    Boolit Man Newboy's Avatar
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    Use a single base powder instead of a double base. It wonít affect the coating, and wonít discolor the powder measure tube.

    I use VV N320


    Sent from my iPhone using Tapatalk Pro

  5. #25
    Boolit Master rsrocket1's Avatar
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    Quote Originally Posted by Newboy View Post
    Use a single base powder instead of a double base. It won’t affect the coating, and won’t discolor the powder measure tube.

    I use VV N320
    Nice powder, but expensive. The jury is still out as to whether double base powder is harmed by PC but my experience says not enough to make a difference. I store all my loaded bullets lead-up plus I rarely leave loaded rounds sitting around for more than a month before shooting it.

  6. #26
    Boolit Master
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    Quote Originally Posted by rsrocket1 View Post
    Nice powder, but expensive.
    If you like N320, Sport Pistol is a drop in engineered replacement of N320 at half the price.

  7. #27
    Boolit Man retrobass's Avatar
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    I use both N320 and Sport Pistol with my coated bullets, love em! Even if youíre shooting titrgroup the same afternoon as loading, it burns so hot that coated bullets get Smokey and lead my particular barrel. Also titegroup is a real pain to clean out of the hopper. I save titegroup for plated bullets. Thereís no excuse not to get Sport Pistol from powder valley. As igolf says, itís a half priced N320!

  8. #28
    Boolit Man Newboy's Avatar
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    Sport Pistol is also a double base powder, I believe.


    Sent from my iPhone using Tapatalk Pro

  9. #29
    Boolit Master popper's Avatar
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    As propellants are either/and nitroglycerin or nitrocellulose - both which destabilize(outgas) an acidic compound, our ethylene/glycol based PC deteriorates. The slow (double based) powders typically have more stabilizers added ( reduced outgassing) therefore the effect is less pronounced. Solution? Switch to Hitek, use a paper GC, wipe the base with liquid wax, etc. I don't use any of theses powder so not my problem. As the outgassing is NORMAL, performance of powder will NOT change. Old powder is old powder.
    Whatever!

  10. #30
    Boolit Man
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    Used to be a die hard N320 user for 9MM. Now Sport Pistol is my go-to for 9MM, .357 Maximum, 44 Mag & 45 LC plinking rounds. For full power I still like VV-N110. I generally load up a bunch of rounds as time permits and store them in .50 call ammo cans. Besides metering well in my Dillon press, Sport Pistol was specifically made for coated lead rounds so as not to degrade the coating over time.
    Alcohol Inventory Reduction Specialist (Journeyman Level)

  11. #31
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    buck1's Avatar
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    Interesting thread!
    About a month ago I loaded some Eastwood copper penny PC boolits over some wc820 surplus but had one round that didn't quite get sized enough. I set it aside To take it apart later. I just did and no issues pc looks good and tough still.
    NRA LIFER .. "THE CAST BULLET HANDLOADER IS THE ONLY ONE THAT REALLY MAKES ANY OF HIS AMMUNITION. OTHERS MEARLY ASSEMBLE IT". -E.H. HARRISON

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  12. #32
    Boolit Master GunFun's Avatar
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    I have a jar of mixed powders from pulled down bullets, and I put a few PC bullets into it when I read this thread. So far no apparent effects as of Saturday. I will probably borrow a couple baby food jars and do more specific tests later.
    In the market for a multicavity Mi-Hec 9mm HP mold.

    I presently cast for .380 ACP, 9mm, .38/.357, 30 cal and .45 and 12 Ga slug.
    I am particularly grateful for the help I have gotten from members Red333 and MSRdiver, and OLD Para (who made a crazy mold on my design!!!!!) as well as excellent guides by Recluse for his ideal lube process. I have been experimenting with poly coating too.

    PM me if you know of a very cheap source of birdshot, or an efficient way to make #4 Buck.

  13. #33
    Boolit Master dbosman's Avatar
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    From http://www.alliantpowder.com/product...rt-pistol.aspx
    Sport Pistol's low-muzzle-flash formulation is also optimized for polymer-coated bullets, whereas comparable powders can dissolve polymer coatings at the bullet base during ignition.

    I find the terms confusing. "dissolve polymer coating" and "during ignition." I wonder if they mean solvent type dissolving? or flame burning?

  14. #34
    I’m kind of late to the game.

    Does anyone have of the factory ammo that’s being coated ? The federal Syntech.
    I would venture to guess federal already tested it but who knows.

  15. #35
    Boolit Master
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    Curious, aren't ESPC boolits bare based usually? I have heard people say this isn't an issue... maybe better for long term storage?

  16. #36
    Boolit Master OS OK's Avatar
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    The following casts were loaded with Herco, Power Pistol, BullsEye & Titegroup...stored cast down for over a year before shooting them...nothing to report here...



    These BBSWC's were loaded with 700X, stored over a year cast down and were PC'd with clear gloss. The PC is gummy feeling like a hard rubber gasket, you can poke into the PC with the point of your pocket knife...still, outside of the yellowing and the gummy feel, nothing to report here either...

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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