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March 31, 2009
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I plan to use more powder, eventually. But I doubt I will ever get over what Frank Barnes suggests. Unless, someone can come up with the published chamber pressure created using more powder. The erratic speeds will go away once I get my filler issue and the neck tension worked out.
Look at any loading manual. You see that with different powders you use different amounts to create the same speed. That’s because some powders create more pressure at a given speed.
I would be interested in reading about what Dupont wrote.
March 31, 2009
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I took a look at the loads I use for my 45-90’s. The 40% formula would state to use 36 grains. Barnes states that 1,530 fps was the factory black powder load using a 300 grain bullet.
I use 31 grains of IMR 4198 for 1,540 mean fps. 43 grains of IMR 3031 for 1,548 mean fps. 24 grains of IMR 4759 for 1,508 mean fps. Each of these loads were shot at least 60 times to get the average speed. My old chrono had a printer. I did not keep the tapes but I did put all of this data on Excel spread sheets for my files. Including the amount of TP I used.
Today I keep a log book, an Excel spread sheet and the targets.
March 31, 2009
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I fire formed 5 more cases today. I used full loads of black powder. Messed up on one shot. With all the smoke I can’t see where the bullet is hitting so I looked up just as I shot. Butt hit my collar bone. That felt good.
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