Does actual bore measurement matter?

[Bruce in WV]

I rebuilt a USAK 50 that I had to lap fairly aggressively to make it shootable. The result is a barrel with clean, sharp lands, and smooth (but pitted) grooves. I don't know what the original bore spec was for the American Knight, and I have no idea how much I opened up the bore as a result of the lapping process.
It shoots OK so far with a light 50 gr/3Fg and Knight 250gr sabot/bullet test load, and I'm ready start working up the hunting load for this Fall.
I haven't measured the new bore diameter, and since its a Knight factory 50 sabot/bullet load thats shooting pretty good already, my question is "does knowing the actual measurement of the bore matter"?

 

[ElDiablo]

No, as long as the sabot or bullet fits. “Fifty caliber” rifles range all the way from .499” or so to .506”+.

And..as we have all read here frequently, some manufacturers produce barrels that range wildly from breech to muzzle.

 

[white eagle]

I would have to say no
if you make your own bullets you can make them any size you need to.