An easy check for headspace of a single shot's barrel is to place a cartridge in the chamber and place a straight edge across the end of the barrel. The headspace of the cartridge being used can then be measured using feeler gauges. If that checks out okay, then you can check the fit of the barrel to the frame using sight, feeler gauges, or paper strips. Close the barrel and look at the side with a light on the opposite side. If light shines between the frame and barrel, then the gap can be measured with paper or feeler gauges. Up to .002 gap between frame and barrel is of very little concern. Cartridge head to end of barrel should be .005 or less, ideally but up to.008 should still be safe. If the cartridge has been reloaded with properly adjusted dies, your headspace measurement should be .001-.002. If you use a variety of ammunition sources, you may find variation in headspace measurements from one to the next. Using a commercial go gage and feeler gages will allow you to know if headspace is within SAAMI specs.
2120-September 1, 1945
To: D A MacArthur /C H Nimitz
From: H S Truman
Political Correctness is a doctrine, recently fostered by a delusional , illogical minority and promoted by a sick mainstream media, which holds forth the proposition that it is entirely possible to pick up a piece of cr*p by the clean end!
Now, with special thanks to the Truman Museum and Harry himself, you and I finally have a full understanding of what "POLITICAL CORRECTNESS" really means.....