there is some of the best minds here and possibly this has been gone thru but please bear with me. My levergun, just out of curiousity one day was slugged by yours truly. I used 3 #8 sinkers to fit either a .44 or .45 caliber bore and slugged at front of bore, rear sight area and completely thru the bore starting at the front. I am getting 3 different measurements, @ front of bore behind the front sight measure is .457/5", @ rearsight area by the dovetail cut measure is .459/5", and thru the bore completely starting at front of bore down I NOTICED in midbore was the the tightest measure is .455/5". I am not going to began to say anything of the next step cause I have heard of some and do not want to buy any products without some unbiased(is that the word?) opinions. Your knowledge and expertise is required if you would be so kind. This particular levergun is a 1895G-.45-70

Does the rifle have accuracy problems? If not, what difference do these slight discrepancies make in practical terms?

thats typical for any barrel that has dove tail cuts tube supports and front and rear sights. the ares where the metal was machined will also change the dimintions inside.
some muzzle loaders are real bad.

hivelosity and Rick,
good points. I have zeroed my scope guns and never this particular rifle. I have "ranged" this numerous times and it is successfull and seemingly quite accurate at freehand. Have killed both grizz and moose quite quickly so your point is recognized and received graciously.Just wondering about the variances, my Ruger .45colt needed the Tubbs finish and it improved it greatly but was very hesitant to do on my levergun. Hivelosity, intriguing pointers. Thanks fellows, I appreciate your help.

Button rifling causes stress to the steel because it displaces material(rather than cutting it)to form the lands and grooves of the barrel and when that steel gets thinned by contouring, cutting dovetails, etc, some of the stress gets released and that can cause bulges, warping, etc.

If the gun shoots well I would screw with it.

"button" rifling is understood.
Mahsii'