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45-70 duplex load
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Old 01-03-2005, 10:52 PM
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Default 45-70 duplex load

There had been question once on if I had ever worked duplex loads in my cartridge rifle. Going through my very old reloading books I found this handwritten load on my 45-70 trapdoor page. I will say again I do not think these worth the effort but for those who wish to experiment here is the one load I have found so far. As it includes Pyrodex RS my assumption after all this time is that I was trying to get more efficent burn.

THIS DEFINATELY FOR SINGLE SHOT RIFLES ONLY

Federal 210 Primer
340 Grain flat nose hand cast lead bullet.
5-10 Grains Unigue for igniter
Fill case with Pyrodex RS till light compression with bullet seated.
Very little or no crimp, you want the bullet to hold the compression on the powder and not shake out in normal carry in pouch or pocket. This will be between 52-56 grains Pyrodex RS.

Effectively this creates a hot primer. Start at 5 grains and work up. Stop when your groups fall apart.

I was playing with this idea some twenty plus years ago and do not now use these loadings now. Finding using black powder in 2F or smokeless loaded down to Trap Door pressure levels completely satisfactory for the game I hunt. Mainly Whitetail deer and hog with this weapon.
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