Duplex for 45-110 fouling control

This is the place to discuss your duplex and smokeless loads for your black powder guns. All SAFETY concerns must be addressed, and high pressure loads are NOT to be promoted here.
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Duplex for 45-110 fouling control

Post by Mecharius » Fri Jan 27, 2017 3:34 pm

I am looking at Duplex Loads purely for fouling control. I stick to pure BP when shootinh from the rest, but sometimes I like to take my rifle up for mountain hikes, where having a cleaning rod and blowtube out and ready may not always be the easiest. I have been looking at ways to keep my bore clean-ish (relatively) to maintain accuracy over multiple shots during this "field" range time.

C Sharps Arms 1874 Bridgeport 45-110

Normal powder of preference
Swiss 1.5 F

Buffalo Arms 545 grain .446 for paper patch

Smokeless rifle powders i have
IMR 3031

Open to suggestion on what powder to use, and what grain to start with and work up from. Willing to try other powders than what I have already of course, but maybe I will get lucky and one of the two I use the most will work.
Any suggestions, information, or anecdotes would be appreciated. Thank you in advance.

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Re: Duplex for 45-110 fouling control

Post by MikeR » Fri Jan 27, 2017 7:24 pm

In my Shiloh's I use a .440" 20/1 bullet patched with 9# onion skin from thepapermillstore.com. They are about .004- .005" smaller than bore. Try 100 to 110 grains of Old Eynsford 2f with a card wad cut from paper milk cartons then compressed to .400" below the case mouth. Then add a .25" lube wad of DGL and top it with another milk carton wad and then use a bushing die or taper crimp die to reduce the case mouth to hold the bullet.

This is a load very similar to what I use for hunting. The wiping rod stays in the truck and the blow tube stays home. Swiss is my least favorite powder for shooting "dirty", the fouling is too gummy. My favorite powder is KIK 2f but preliminary test with OE seem to be going well. Try this and maybe you wont want to try duplex loads.


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Re: Duplex for 45-110 fouling control

Post by Freedom » Tue Jul 11, 2017 6:26 pm

BlackHorn 209 is factory mixed duplex powder mixed with real KIK BP and nitro... And it works GREAT!

The powder just took 1st and 2nd place at the Montana 1000 shooting match when temps went to over 105 degrees with no fouling control. Of course the guns were being directed by a couple of the best shooters around.

If you are going to duplex, BH209 is the only way to go. Recoil and velocity can get too high for my taste with a full case but single digit ES is easily obtained with a filler like Cream of Wheat used over the powder to fill any extra case capacity.

It seems to cost more, but 36 grains with get you to top BP velocity, so you don't need much

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Re: Duplex for 45-110 fouling control

Post by horseman308 » Fri Jun 26, 2020 8:20 am

Ok, gonna resurrect this old thread in hopes someone sees it. @Freedom mentioned using Blackhorn 209 as a duplex option. I've been reading on it, as I like the idea of not having to mix my own duplex. I have a couple questions:

1) Reading their load data chart (for .45-70), they reference a weighed charge of 32.9 grains for a 500g bullet. I understand there needs to be filler to close the gap between the powder column and the bullet base to keep pressures at a safe level. In general, would the case still need to be drop tubed? Would it need compression?

The only bullet you fire is the one in the chamber. Make it count.

Old Soldier
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Re: Duplex for 45-110 fouling control

Post by Old Soldier » Thu Aug 27, 2020 5:01 pm

I don't have a 45-110. I have used duplex in 45-70 and 38-55. I like 4227 or 5744 about 5 grains has done it for me. I even have a little ideal powder thrower I use for the priming charge. I started using duplex loads in the winter, as the fowling freezes, and really eats the bullet. I have recently decided to only use smokeless in the winter. I can use 40 grains of smokeless at $25 a pound, or 70 grains of black at $25 a pound. That's most double the shots per pound with smokeless powder. Also, I can buy smokeless locally, black not so easily.
"I wish it to be remembered that I was the last of my tribe to surrender my rifle" Geronimo