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RSW
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Speaking of Trail Boss . . .
Oct 21st, 2014 at 6:22pm
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Has anyone ever used Trail Boss as a priming charge for duplex loads? I'm asking out of an abundance of caution. I've read where TB is prone to pressure spikes when compressed and while my loads will not be compressed, I will use a drop tube to load cases to obtain consistent powder density.
Typically I use 4227 or 4759 but I'm running some accuracy tests with different blacks for main charges and thought I'd try different smokeless priming charges also.
Thanks
« Last Edit: Oct 21st, 2014 at 6:29pm by RSW »  
Randy W
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.22-5-40
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Re: Speaking of Trail Boss . . .
Reply #1 - Oct 21st, 2014 at 6:45pm
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Never used TrailBoss for priming..but I did use PB next to primer in a .25-25 Stevens filling rest of case with Swiss 3FG.  This cleaned up bore to the point it looked like a regular charge of H4227 had been fired.  Accuracy was excellent.  However for match accuracy I still needed 1 patch thru after each shot..though with the PB..I could use a dry one instead of barely damp one with straight Swiss..Figured it wasn't worth the trouble..especially if needed to pull loads.  Went back to straight black.
  
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Re: Speaking of Trail Boss . . .
Reply #2 - Oct 21st, 2014 at 6:52pm
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Randy,
Will this be for shooting a match? If so, I'd be interested in attending such a match.

Frank
  
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RSW
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Re: Speaking of Trail Boss . . .
Reply #3 - Oct 21st, 2014 at 7:06pm
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.22-5-40
I guess I'm just too dense to understand; what's "PB next to primer"? Please explain.
Thanks

Frank
I have delusions of adding a pre-1900 themed event to our annual Arizona State Schuetzenfest but doubt it would attract enough participants to make it worthwhile.
  
Randy W
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Re: Speaking of Trail Boss . . .
Reply #4 - Oct 21st, 2014 at 11:34pm
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The PB..and I was only using 1.0-2.5grs. goes in first..then black on top.
  
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RSW
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Re: Speaking of Trail Boss . . .
Reply #5 - Oct 21st, 2014 at 11:56pm
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.22-5-40
I'm still in the dark, "PB" is too cryptic for me to understand what you are using for priming.
Please elaborate.
Thanks
  
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Re: Speaking of Trail Boss . . .
Reply #6 - Oct 22nd, 2014 at 12:18am
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I do believe he is referring to IMR PB, a fast burning handgun/shotgun powder.
  
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RSW
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Re: Speaking of Trail Boss . . .
Reply #7 - Oct 22nd, 2014 at 12:29am
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craigster
Thank you. Now it's all perfectly clear. PB is a powder I'm not familiar with so I just didn't understand what .22-5-40 was using for priming charge.
  
Randy W
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Re: Speaking of Trail Boss . . .
Reply #8 - Oct 24th, 2014 at 10:53am
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.22-5-40 wrote on Oct 21st, 2014 at 11:34pm:
The PB..and I was only using 1.0-2.5grs. goes in first..then black on top.


"The PB..and I" ?    Strange.  Huh?  Huh

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Chev. William
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Re: Speaking of Trail Boss . . .
Reply #9 - Oct 26th, 2014 at 11:28am
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RSW wrote on Oct 22nd, 2014 at 12:29am:
craigster
Thank you. Now it's all perfectly clear. PB is a powder I'm not familiar with so I just didn't understand what .22-5-40 was using for priming charge.


I believe the correct term for this is a "Booster" Charge, which is placed between the Primer and the main Propellant charge, similar to the pad of Black Powder that was sewn to the rear of Smokeless Powder Propellant Bags for use in the Naval 16 inch Main Guns.

Best Regards,
Chev. William
  
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RSW
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Re: Speaking of Trail Boss . . .
Reply #10 - Oct 26th, 2014 at 3:20pm
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Chev.
I have no doubt that booster charge is the correct Navy nomenclature. Harry Pope referred to it as a priming charge in the instructions he wrote for duplex loading the 32-40, in 1912 and there are other references from that era using priming charge to describe the use of smokeless powder to help ignite a main black powder charge. 
There isn't really right or wrong nomenclature in regards to the schuetzen game, either priming or booster charge will be understood by today's schuetzen shooters. I think it's just a matter of common usage.
  
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Re: Speaking of Trail Boss . . .
Reply #11 - Oct 26th, 2014 at 5:28pm
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I've always heard of it referred to it as a duplex load. In addition to whatever else it does, it can result in a much cleaner/less fouling load.
  
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Re: Speaking of Trail Boss . . .
Reply #12 - Oct 26th, 2014 at 6:54pm
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Back in the mid 90's, I shot a lot of duplex BP at the Springfield, OR matches and at the JSSS matches here. At a couple of gun shows, I bought 2 lb of Dupont Bulk Shotgun Powder that I was going to use for duplex loads BUT, I hurt my shoulder, shooting a 45/70, 500 gr duplex load and didn't get back into shooting until 5 years ago. I still have that Bulk powder though Smiley

There are two powders that you might want to look into, Hodgdon Blackhorn and Alliant Black MZ. From what I've read the Blackhorn is formulated much the same as the old Bulk Shotgun powder and from what the label on the Black MZ says, it sounds like it could be simular.

The Blackhorn, is outragously priced but, the Black MZ is $20 a pound and if I had matches that allowed duplex, I'd use my Bulk and try that MZ.

Lets have more duplex shoots Smiley

Frank
  
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Re: Speaking of Trail Boss . . .
Reply #13 - Oct 26th, 2014 at 7:14pm
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The duplex load that I use (when I use it) for the 45-70 (and similar sized rounds) is 7.0 grs of 2400 under the black.
  
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