m1903a1 tryout results

[browningautorifle]

I think I got very lucky.

Maybe, but that's how you start with reamers if you have no one there to instruct you. You move slow and careful and the end result is the same. I had an M1 rifle come to me that had a perfect barrel, except someone had thought it too tight and overdone it a couple turns. New brass showed a separation line...no issue with military ammo and not reloading but that's not here in Canada.

I did learn to turn the reamer a few more turns with no pressure before backing it out (still turning while pulling out). This helps to make sure there are no burrs.

That also brings out the bits. You could have used brake cleaner for the cleaner, it has pressure and a long tube to reach inside. Go muzzle down and it blows everything out and leaves it dry for testing. Next time... Anyway, well done. By the way, it might still want a touch of polishing.

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[ssgross]

By the way, it might still want a touch of polishing.

I did indeed polish it again. Very happy with the results.
I also double checked the the max CBTO again with my Hornady gauge. It is about 6 thous. less free bore now than there was. Assuming that I didn't cut the throat at all, (I didn't notice any debris on that part of the reamer), this must have been how much more I pushed the shoulder in. I was tempted to put steel blue layout fluid in there to take pics, but decided against the high likelihood of making a big sloppy mess of it.