Groove diameter: I pounded a .4305 diameter soft lead bullet down the bore, thinking that would be wide enough. Upon exiting, I could see that the lead slug had not even touched the bottoms of the grooves. This old 44-40 has a groove diameter of at least .431 if not even bigger.
Bullet: 200 grain plain base bullet from Lyman mould 427666, using wheel weights sized to .429.
Load: 18.5 grains of 5744 for about 1,286 fps. Here's a photo of my cartridges ....
I was not at all optimistic about this first range trial because my lead bullets were undersize by at least .002 if not more. I expected that leading would commence fairly rapidly and within one or two shots, I would not even be on paper. 18.5 grains of 5744 gave me original black powder ballistics, but with a significantly lower peak pressure, which would make it unlikely that the bullet would be bumped up to seal the throat. Regardless, I decided to head off to the range to establish a lower baseline for bad loads.
Shooting set-up: For fine shooting were accuracy is important, I use my shooting bag for a rest. I don't have one of those fancy expensive bench rests, but someday I'd like to get one. I rested my left fist on a pile I made up of my iPhone with my wallet stacked on top of it. The rear stock then rested on my fist, which sat on top of that little pile. Here's a photo of my shooting set-up ....
Results:
Since I had no idea where the sights pointed, I took a shot at 50 yards to see if I was on paper (8 ½" x 11). The windage looked good and I was a bit high. I figured I should be good for 100 yards, so I took a shot at 100 yards and went down to look at it. Bang on. I then changed the paper and went back and took 3 careful shots. It was hard because that front sight was blurry what with my old eyes and the wind making them teary. Then I went down to check. What a surprise! The three shots gave me a group of 2 1/8" at 100 yards. This old '73 has potential, as I'm sure that group was a bit loose due to the fact that the sights were blurry. A younger fellow could really drive tacks with this old gun. Here's the target ....
I then put up a fresh sheet and used my last five rounds. Two of the shots were right on where they should be. The third was a couple inches left and high, and the last two were just off the paper to the right. I figured the old '73 was starting to lead up with those undersize bullets. Still, the first 7 rounds were all bang on. I went home and peered down the barrel. Clean and shiny from the muzzle end, but looking through the breech end, it looked like leading in the grooves just forward of the chamber. When I shoved that first piece of flannel soaked in Hoppes No. 9 down the bore, I could feel increasing rough friction as the patch got hear the bore. It actually cleaned out quite easily. Perhaps it is due to the fact that this bore is shiny, smooth and pretty much mint. (Don, I'm getting some turpentine tomorrow).
Next Steps:
I have to bump up the bullet to fill the throat. I have three options:
1. According to my copy of a Winchester 1896 catalogue, their 44 WCF (44-40) bullets were made of 'pure lead'. Those would bump up easier that wheel weights. I plan to make me some this weekend.
2. Use FFFg. That will give me a nice sharp pressure spike significantly higher than my 5744 load.
3. Use a faster smokeless powder to give me a pressure spike closer to FFFg.
I could also go with a combination of pure lead bullet and faster powder. I think I'll start with a pure lead bullet and my 5744 load.
- DixieBoy
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