That's a great question about 10-gauge shotgun shells! The 10-gauge is definitely a beast, known for its power, especially in hunting large waterfowl like geese. In terms of dimensions, a standard 10-gauge shell is usually around 3.5 inches (89mm) long. The diameter of the hull is significantly larger than a 12-gauge. To give you a quick comparison: * **10-gauge:** Larger diameter, typically 3.5" long. * **12-gauge:** Most common, usually 2.75" or 3" long. * **20-gauge:** Smaller diameter, often 2.75" long. The 10-gauge delivers a lot more payload. You'll commonly find shot loads ranging from 1.5 ounces up to 2.25 ounces, sometimes even more for specialized loads. This allows it to throw a much denser pattern of shot at longer ranges compared to a 12-gauge, especially with larger shot sizes like BB, BBB, or T shot. Shell types are pretty straightforward – mostly lead or steel shot, with steel being prevalent for waterfowl due to environmental regulations. You'll find a good selection of high-velocity loads designed for long-range performance. Do you have a particular use case in mind that sparked your curiosity about the 10-gauge?