While Speer #8 is world famous for some of it's loads, they're not the only ones with some data that might raise eyebrows-and possibly some gun parts.

When the 125 gr JHP.357 bullets first came out Hercules put out a fresh data sheet that featured loads for the bullet. The .357 Magnum data startled me. Was really close (same?) to data for the .44 Magnum with 250 gr hard cast lead. I did some comparative volume calculations and decided there just HAD to be a mistake. Hercules came out with a revised data sheet within a month. I kept both for years but they unfortunately disappeared during one of my moves.