“10mm”

Developed in 1976 by Ken Waters as a wildcat cartridge, the 7-30 Waters is based on the .30-30 Winchester necked down to 7mm to improve velocity and trajectory, with a significant drop off in felt recoil. In 1984, Winchester began to produce rifles chambered for cartridge, legitimizing Waters’ dream, and establishing it as a commercial cartridge.

In 2003, Finnish firearms manufacturer Sako released its own variant of the 9.3mm rimless cartridge: the 9.3x66mm Sako, or as it is known in the U.S., the .370 Sako Magnum. It delivers performance on par with the beloved .375 H&H in a package which can hold one additional round in the magazine in a lighter rifle.

Semi-automatic and striker-fired, the P320-XTEN is extremely accurate, easy to shoot even with powerful 10mm loads and holds 15-plus-one rounds.

Hornady’s dive into a .17-caliber rimfire was met with fanfare, as it truly was—and still is—a decided improvement over the long-range ballistics of any of the .22 rimfire cartridges.

For defense in the backcountry, look no further than Winchester Big Bore. Whether bear-hunting or simply seeking bear defense, Big Bore delivers the penetration and energy transfer needed to stop a big ursid in its tracks.

Available in handgun calibers popularly carried in the backcountry, Winchester's Big Bore ammo was designed to offer consistent expansion, massive energy deposit and most importantly, trusted functioning.

The goal was to build a magnum-class cartridge in a small package, and Weatherby has done just that with its 6.5 Weatherby RPM, featuring a rebated rim, large body diameter, low body taper and 35-degree shoulder.

Get a closer look at Federal Premium Solid Core 10mm, the latest addition to our #SundayGunday series.

Despite the magnum moniker, the .327 Federal Magnum is a pleasure to shoot, giving it a lot of flexibility. It is a viable defensive cartridge, and in a hunting rifle, is a great choice for when shot distances are on the shorter end of the spectrum.