According to the postmark on the envelope that contains the handheld Powley Computer, I purchased it about 15 years ago! Back then, I absolutely hardly had the funds to purchase a chronograph because the inexpensive, but fairly accurate ones werent readily available. Regardless, the Powley computer was like a slide rule. It functioned on the fact that its data was based on IMR powders. I used it for my 270, 308, 30-30, and later the 7-30 Waters. I recorded the predicted velocities using the powder charges of IMR powders that the Powley computer recommended. I could crudely use points of impact to sort of verify velocities and they were dang close as predicted by ballistics manuals. Later, I purchased a chronographI now have 2and just for curiosity, I compared the Powley predicted velocity to the chronographed velocities. They were literally within a couple of percentage points of what the chronograph registered. So, it appears the Mr. Powley was able to predict velocities to a fairly good degree of accuracy. But, my oh my, how tedious that handheld Powley computer was to manipulate. It will be a part of my reloading equipment, although not used anymore, to be passed on to some other reloader. I wonder if that person will even know what it was intended to be use for. And so it goes
BCB
