Jimm,
What make, and caliber is this rifle?
Best bet take it to a reputable gunsmith with Hawkeye borescope, or equivalent, and the rest of the troubleshooting gear...Have the headspace checked, and the throat measured..An untrained eye could waste a lot of money buying a gadget such as an endoscope, if you're going to go to the trouble of purchasing a borescope, just as well have the smith rebarrel the rifle. One thing a guy can try on his own is cleaning the barrel, to the bare bones..
Some people seem to find it hard to believe that barrels wear out..Think of them like light bulbs, when they burn out, replace them..No need to buy another rifle, just replace the part, it is a wear part..
Edited because I may have missed the point...
If your rifle is 1MOA capable, which is 2" at 200 yds, that's good for factory, and if you 'just want to know where you stand', take it into a reputable gunsmith and see if he has the gaging to tell you what you want to know about the rifle's internal measurements..If you feel you want it to shoot more consistently, have a chat about bedding and recrowning..
sorry if I read more into this than necessary!!
JR