M721, The Range Rods I make are .439" for 45 cal. The rod needs to fit the bore snug yet have just enough space to move freely. Something is bad wrong if they sent you a .4415 rod ?????
I started making more advanced Range Rods like in the below photo. Except for 22 cal (top 2 in photo) all centerfire rods are 1/4" with a properly sized head that fits squeaky tight in a slightly crimped chambered case.
I quit making and using Range Rods when I discovered you could get a decent endoscope for 20 bucks. I now connect the endoscope to my laptop and can see any obstruction in the bore plus cylinder-to-bore alignment.