The Loads
The mold supplied was an Idea/Lyman #406169 which dropped a 0.408" bullet weighing 260 grains of the wheel weight alloy I had on hand. I lucked out because the groove diameter of old .40-82 measured 0.408" instead of the nominal 0.406". Cases supplied were RCBS .45 Basic with a length of 3.25". Those were hacksawed to just over the .40-82’s length of 2.40" then trimmed to the final spec. Next, a now-forgotten charge of a likewise forgotten smokeless powder was dumped in 20 cases. Bullets were seated and crimped and I was ready to shoot.
Only I wasn’t! The rounds were too fat to chamber. It had not occurred to me the .45 basic case walls increased in thickness from case mouth to case rim. Thinning the case walls was the cure so RCBS tooling for the chore was acquired. Again I thought everything was a go. It wasn’t. Every shot fired gave a click-bang. The click was the hammer falling. The bang was the powder charge firing a second or so later, meaning it wasn’t igniting properly. At least the bullets passed through paper targets point on. Some research revealed an old remedy for poor powder ignition was to fill the case atop the powder charge with corn meal. The fix worked and the old rifle began to shoot beautifully. In fact we took it hunting and I shot an elk with it.