DB,
When you got these different measurements from the SAME RIFLE did you use the same bullet? Or did you use a different bullet? Just asking as the four thousands difference is not significant considering the method that you used. But....just my curiosity. ;D
As to "Will each rifle differ?".....Yup!! You bet. In fact, I'd be surprised if they didn't. I have two Shilen barrels for my Savage. Each one is chambered in 6.5x55 and each one has a different free-bore. The light-contour has more than the bull barrel.
Now.....for the "older models" it could be that if they have been shot a bunch, you may be seeing throat erosion. Or it simply could be that the spec's for throat rheeming "back in the day" were different than today. I don't know but someone who may know may chime in on this.
Still, if your bullets will not touch the lands, you may get different results by trying different OAL's on your handloads with your older rifles. If you already have an accurate load for these....then don't fix what isn't broken.
MHO
Dave
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