The 45 ACP cylinder on my revolver has a different cut chamber. They fit into the chamber and had no problems with the plunk test. Blue line is the brass case, red line is the bullet, and black line is the cylinder bore wall.ĭoes this make sense to anyone else? The rounds loaded to normal length fit fine in my Glock G-30SF. The lead is soft enough to deform, but fails the cylinder round plunk test. If I seat the round at the length the reloading book suggest the bullet 0.001" to big to fit into the cylinder bore.
Cylinder bore is 0.452" and bullets measure at 0.453". Here it is with the measurement of the cylinder bore. Here is the same cylinder with an empty 45 ACP case in it. Dotted line is where the cylinder retailing pin slides thru. Here is a side view of the bare 45 ACP revolver cylinder. All goes into predicting how much performance you can expect out of a given weapons system.Here is some basic CAD drawings I whipped up. Some of the ways in which expansion ratios can be changed are via larger capacity cases (obviously) or lengthening or shortening barrel length.
The 22 Long Rifle rimfire, very high expansion ration, lower performance, but it delivers this with much greater efficiency. The 220 Swift is an example of a cartridge with a very low expansion ration, but which delivers very high performance. Those with very high expansion ratios are generally going to deliver lower overall performance, but will do so with far greater efficiency. Cartridges with very low expansion ratios generally give the highest performance, at the cost of efficiency. Expansion ratio is what determines which powders are appropriate, which are too fast or too slow, and ultimately, what sort of performance you'll get from a given cartridge. In short, it's how many times that volume can expand within that closed system. If possible, measure the velocity and correlate with our data.Įxpansion ratio is the ratio of bore and chamnber volume to that of the powder chamber alone. Ø Most Handgun caliber/powder combinations as well asģ. CAUTION: Beware of double charging if the loading density is below 50% of the available volume. ALWAYS BEGIN LOADING AT THE RECOMMENDED MINIMUM “START” LOAD and develop loads in 2% increments towards the MAXIMUM load.Ģ. It’ important to note that SAFETY is our prime concern therefore we strongly recommend.ġ. In the future if you want one powder for both calibers I would recommend trying Accurate 2200. We do not recommend using 1680 in the 5.56, but it will work and will work better with the lighter bullets. I have enclosed some data for you to use. Scott from Ramshot did get back to me with some data, along with a recommendation of another powder better suited for dual purpose here.
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