The easier way to do it is to take a pure, round soft lead fishing weight and insert it into the chamber of your Krag. Then tap it with a wood dowel slightly smaller in diameter than your bore to push it into and down the length of the bore. When it taps out the muzzle, you will have a resized lead weight that reflects the smallest diameter of the bore that it traveled down. If you drip a little oil on the weight before tapping it down the bore, it'll go a little easier.

One disadvantage of this approach is if your bore is pitted bad, it will chew up the lead weight a lot before it drops out the muzzle. It will also leave behind small chunks of lead in the pitted areas, similar to shooting a cast bullet in a badly pitted bore.

I use a Hawkeye Bore Scope. That was the best investment I have ever made for my gun collection. I love looking into bores before and after cleaning. Really teaches you what works and what doesn't work with cleaning your guns. Also it's irreplaceable for examining older military firearms for bore condition and damage.

I have done the lead weight approach but now I use Cerrosafe to make an actual casting of my chamber that gives me measurements I need for reloading. Each chamber can be slightly different. But, it's a good and safe way to get a lot of info about your rifle or carbine.

Brownell's sells Cerrosafe. It melts at a real low temperature and hardens quickly. Safe to use.

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