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Reverse Duplex (Read 8061 times)

boats Frequent Elocutionist Offline Posts: 7728 Location: Virginia Joined: Apr 23^rd, 2004	Reverse Duplex Feb 19^th, 2016 at 9:04am	Print Post
	Reading Whelen's "The American Rifle" on the 25/20 Repeater cartridge. He talks about barrel pitting from corrosive primers. Said he duplex loads 2 grs of 2 F Black over the primer then Smokeless powder. Black lessens the corrosive effect. Never heard that one before. If you don't have this book it's well worth the cost. Paladin Press has a paper back reprint edition. Boats


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40_Rod Frequent Elocutionist Offline Extremism in the persuit of accuracy is not a vice Posts: 4285 Location: Knoxville, TN Joined: Apr 20^th, 2004	Re: Reverse Duplex Reply #1 - Feb 19^th, 2016 at 9:20am	Print Post
	There are a number of Duplex loads that used a priming charge of black and a main charge of smokeless. In the early days of smokeless the primers weren't up to the task of reliably setting off smokeless powders. Most of the primers were designed to light black powder that ignites relatively easily. The solution was to use a few grains of black with the older primers to get the party started. In time manufacturers made stronger primers for smokeless loads. 40 Rod


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RSW Frequent Elocutionist Online Posts: 1297 Location: Arizona Joined: Sep 8^th, 2006	Re: Reverse Duplex Reply #2 - Feb 19^th, 2016 at 10:10am	Print Post
	40_rod is exactly correct. Perhaps it will provide a more complete understanding to know that the common smokeless powders of that time such as: -DuPont Bulk Shotgun Smokeless -DuPont No.1 Smokeless -DuPont Schuetzen Smokeless were all bulk for bulk replacement smokeless powders for black. For example, 40 grains (bulk measure) of black powder was equivalent to 40 grains (bulk measure) of DuPont Schuetzen smokeless. Therefore, a few grains of black powder as a priming charge were there to better ignite the main smokeless powder charge which filled the remainder of the cartridge case.

	Randy W ASSRA 10211 - ISSA 125 There are indeed two Americas. Simply put, it is not the haves and have nots. The two Americans are in reality divided into those who do and those who don't.
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boats Frequent Elocutionist Offline Posts: 7728 Location: Virginia Joined: Apr 23^rd, 2004	Re: Reverse Duplex Reply #3 - Feb 19^th, 2016 at 11:09am	Print Post
	I gave a short summary. Chapter itself Whelan goes into the various powders of the day how Alkaline they are and how they contribute to corrosion. As well as the ignition issues. We don't have gun writers of that caliber today. Boats


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.22-5-40 Oldtimer Offline Posts: 828 Joined: Feb 13^th, 2010	Re: Reverse Duplex Reply #4 - Feb 19^th, 2016 at 11:32am	Print Post
	Naramore writes of bore corrosion from low pressure loads caused by using lighter than normal smokeless loads resulting in excessive fouling in bore which is then left without cleaning.


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boats Frequent Elocutionist Offline Posts: 7728 Location: Virginia Joined: Apr 23^rd, 2004	Re: Reverse Duplex Reply #5 - Feb 19^th, 2016 at 6:24pm	Print Post
	I will have to look that up in my Naramore. Not that's important, just interesting Thanks for the tip Boats


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BP Frequent Elocutionist Offline Posts: 8039 Location: Westside Joined: Aug 27^th, 2006	Re: Reverse Duplex Reply #6 - Feb 19^th, 2016 at 6:44pm	Print Post
	Didn't the early instructions for the Ideal No. 6 duplex measure describe using black powder in the priming hopper?

	There are three kinds of men: The ones that learn by reading, the few who learn by observation, and the rest who have to pee on the electric fence and find out for themselves. Proud Noodlehead
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FITZ Oldtimer Offline REGARDS Posts: 917 Location: MASSACHUSETTS Joined: Apr 16^th, 2004	Re: Reverse Duplex Reply #7 - Feb 19^th, 2016 at 9:50pm	Print Post
	The #6 Ideal does have instructions for Duplexing hard to light Smokeless Powder. I have one in its Box with the Literature. Ideal suggested using 3f as it would light off easier and be a Hotter flame. HTH Regards, FITZ.

	FITZ
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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 12333 Location: Why, out West of course Joined: May 29^th, 2006	Re: Reverse Duplex Reply #8 - Feb 19^th, 2016 at 9:50pm	Print Post
	Maybe reverse duplex is the way to load 5744 powder? No wad of course. Joe.

	A blind squirrel runs into a tree every once in a while.
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Schuetzenmiester Frequent Elocutionist Offline Posts: 6707 Location: Cool Wet Side of WA Joined: Apr 27^th, 2008	Re: Reverse Duplex Reply #9 - Feb 19^th, 2016 at 10:42pm	Print Post
	westerner wrote on Feb 19^th, 2016 at 9:50pm: Maybe reverse duplex is the way to load 5744 powder? No wad of course. Joe. No ideas about 5744, but it worked pretty good on the Missouri and he sister battleships

	"some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence
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John Boy Ex Member	Re: Reverse Duplex Reply #10 - Feb 19^th, 2016 at 11:16pm	Print Post
	And many in the BPCR Community wish that the weak BP primers still existed to reduce ignition brisance As an alternative to reduce BPC brisance, I have 12 cases for 3 calibers sitting on the bench as a To Do with SS rings in the primer pockets of 6 cases to reduce the LR pockets to SR and 6 cases without the rings for comparison. Sure wish the SS rings were readily for sale because I believe briance will be reduced using them


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.22-5-40 Oldtimer Offline Posts: 828 Joined: Feb 13^th, 2010	Re: Reverse Duplex Reply #11 - Feb 19^th, 2016 at 11:27pm	Print Post
	I had Rocky Mountain Cartridge turn up from solid, cases for an original Ballard A-1 Mid-Range in .40-63 Everlasting. I had them cut large pistol pockets just for this reason. Only real black..Swiss 1 1/2 will be used in this one.


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Chuckster Frequent Elocutionist Offline Posts: 2312 Location: Colorado Joined: May 15^th, 2008	Re: Reverse Duplex Reply #12 - Feb 19^th, 2016 at 11:32pm	Print Post
	Did I not read here or somewhere about the Coors Matches which allowed duplex loads. 14+grains of 4759 with 2-3 grains of black powder. Chuck


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RSW Frequent Elocutionist Online Posts: 1297 Location: Arizona Joined: Sep 8^th, 2006	Re: Reverse Duplex Reply #13 - Feb 20^th, 2016 at 12:12am	Print Post
	Chuck Do you know in which cartridge case that 14 grains of 4759 plus 2-3 grains of black powder was intended to be used? Thanks

	Randy W ASSRA 10211 - ISSA 125 There are indeed two Americas. Simply put, it is not the haves and have nots. The two Americans are in reality divided into those who do and those who don't.
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westerner Frequent Elocutionist Offline deleted posts and threads record holder. Posts: 12333 Location: Why, out West of course Joined: May 29^th, 2006	Re: Reverse Duplex Reply #14 - Feb 20^th, 2016 at 1:10am	Print Post
	ASSRA, any safe load. Coors, any safe load. ISSA, any safe load. WSU,? Best to bring all your reloading tools and components. Rules could change at any time. Joe.

	A blind squirrel runs into a tree every once in a while.
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