Both the 9mm and .300 Blackout are popular subsonic/supersonic carbine cartridges that can tackle some of the same jobs.
Opinion
Modern Engineering Marvels on MSNOpinion

FBI testing exposed why modern 9mm beat .40 caliber

The FBI’s most important handgun lesson was not that bigger bullets win, but that better bullets and better hit probability matter more. That conclusion grew out of decades of ammunition testing, ...
Modern Engineering Marvels on MSNOpinion

FBI tests show why 9mm beats .40 in real shootings

Why did one of the most argued-over handgun questions end up being settled with gelatin blocks, barrier panels, and ...
Add Yahoo as a preferred source to see more of our stories on Google. A wider variety of 9mm pistols (left) is available, but the 10mm pistols (right) are part of a fast-growing category. The 9mm and ...
Every day someone is buying their first handgun and, for many new shooters, .380 vs. 9mm is a valid comparison to consider. Both cartridges have the same bullet diameter, and user-friendly pistols are ...
SIM-X DEFENSECORE and RANGECORE cartridges use SUBMASS technology with synthetic, non-Newtonian polymer cores and precision alloy jackets, offering a completely lead-free, indoor-safe solution without ...