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Thread: Newbie to Black Powder Cartridges

  1. #41
    Boolit Master
    Join Date
    May 2017
    Posts
    1,505
    Quote Originally Posted by Chill Wills View Post
    For what it is worth, 20 years ago Lee Shaver and I were talking in Raton about duplexing smokeless powder with black powder for Longrange match events (800, 900, & 1000yds). It was legal for NRA matches then as well as in the Canadian matches.
    He had told me he experimented using his match load three ways. Putting the smokeless on the bottom/BP on top. Putting the BP on the bottom and the smokeless on top and last he mixed it all up and dropped it in the case. His observation was, it all shot the same.

    I have used it both smokeless under BP and mixed. I could not tell the difference. I quit there.

    One other quality duplexing may help with is making poor powder shoot better. I learned this shooting with Dennis Bruns last century.


    -There are a lot of right ways to do this..... Have fun and be safe.
    Chill
    Maybe the capitals gave the wrong impression there -----when I load duplex (dont use it much now) they are layered - I never tried mixing it - just more work again and I am inherently lazy.

    Your second point is the most relevant one I think, duplex loading can make crappy blackpowder relatively easy to live with

    Which gets to my third point - I make some nice willow charcoal powder that shoots clean so dont see the need for duplex much anymore

    fourth point - my testing with decent quality powder gave better extreme spread numbers with straight blackpowder than with Duplex loads (it makes sense - why else would the hotshots that run things have ever allowed its use in longrange events ?!!)

    I was surprised by the pressure data thats been quoted - I dont have any way to test that so had assumed that because I was seeing an increase in velocity over the chrony then it followed there would be an increase in pressure ? fair assumption as far as it goes ? and errs on the side of safety -- not the case ? thats good news!

  2. #42
    Boolit Buddy
    Join Date
    Feb 2018
    Posts
    228
    Common misconception. Regarding velocity and pressure it's the pressure curve that counts; not just peak pressure.

    Vettepilot
    "Those who sacrifice freedom for security, have neither."
    Benjamin Franklin. (A very wise man!)

  3. #43
    Boolit Master
    Chill Wills's Avatar
    Join Date
    Oct 2011
    Location
    Colorado
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    2,330
    Quote Originally Posted by vettepilot View Post
    common misconception. Regarding velocity and pressure it's the pressure curve that counts; not just peak pressure.

    Vettepilot
    bingo
    Chill Wills

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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