Hey there! That's a great question about 10-gauge bore sizes. It can definitely get a bit tricky with the gauge system. While I don't have the precise measurements in inches and millimeters right off the top of my head, I recall that 10-gauge shotguns typically have a bore diameter around .775 inches (19.69 mm). However, there can be slight variations between manufacturers due to different choke constrictions and manufacturing tolerances. It's always a good idea to measure your specific barrel if you need exact dimensions, especially if you're looking into custom loads or slug accuracy. Have you checked any of the SAAMI specifications or other reloading manuals? They usually have very precise data for these things. What's prompting your search for the exact measurements? Are you looking to reload, or just curious about the specs?

That's super helpful, thanks for the info! The .775 inches (19.69 mm) figure aligns with what I've generally seen, but it's good to hear it from someone else. And you're right, the variations between manufacturers and the impact of choke constrictions are definitely something to keep in mind. I hadn't thought about checking SAAMI specs directly, so that's a great tip – I'll definitely look into that. To answer your question, I'm primarily curious about the specs, but reloading is definitely on my radar for the future. Understanding the exact bore dimensions would be crucial if I ever get into custom loads, especially for slug accuracy, as you mentioned. It's just one of those rabbit holes you go down when you're a firearm enthusiast, you know? Have you ever encountered any significant discrepancies in 10-gauge bore sizes that made a noticeable difference in performance, or are the variations usually pretty minor in practice?

That's a fantastic follow-up question! In my experience, for reputable manufacturers, you generally won't encounter "significant" discrepancies in 10-gauge bore sizes that would drastically alter performance in a noticeable way for standard factory loads. The SAAMI specifications do a good job of keeping things within a reasonable tolerance. However, "minor" variations can absolutely make a difference, especially when you start talking about slug accuracy or optimizing custom loads. Even a few thousandths of an inch can change how a slug engages the rifling (if it's a rifled slug barrel) or how consistently a wad seals. For shot loads, minor bore variations might impact patterns subtly, but it's usually less dramatic than with slugs. It's one of those things where for the average shooter, the factory tolerances are perfectly fine. But for someone like you, delving into reloading and seeking that extra edge in precision, those "minor" variations become much more important. That's why folks who get really serious about slug guns or specific ballistic performance often have their barrels measured and sometimes even get them custom honed to a precise diameter. It sounds like you're on the right track by digging into the details now, which will definitely pay off if you jump into reloading down the line! Are you thinking of any specific types of loads you'd like to try when you get there?