Slugged the bore. Check my fit.

Shimpy,

You can actually buy Class X pin gauges in 0.0001" increments. The standard sets commonly available Meyer Class ZZ in 0.001" increments with either a plus or a minus 0.0002" tolerance. As the class get tigher, you can get 0.0005" increments standard (Z or Y). But you can order a set that is a center value with 12 gauges above and below the center in 0.0001" increments with either plus or with minus 0.00004" tolerance for just under $200 in this size range. So, you'd get a .430" set that ran 0.4288" to 0.4312" in 0.0001" increments or a center value of .431 to go from 0.4298-.4322" for that price. I'd figure anything smaller than 0.4298 needs reaming.

Personally I find it adequate and far cheaper to learn to use a ball or half ball small hole transfer gauge. Not as accurate, but I can get within 0.0003" with them and a micrometer. Closer if I have time to do a statistical multiple sampling.
 
Personally I find it adequate and far cheaper to learn to use a ball or half ball small hole transfer gauge. Not as accurate, but I can get within 0.0003" with them and a micrometer. Closer if I have time to do a statistical multiple sampling.
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Yes, using a small hole gauge with experience will be accurate enough.
 
I have an idea, have you shot them to see how they shoot? :D
after that you can decide on which problems (if any) to work on.;)
 
Personally I find it adequate and far cheaper to learn to use a ball or half ball small hole transfer gauge. Not as accurate, but I can get within 0.0003" with them and a micrometer. Closer if I have time to do a statistical multiple sampling.
Click to expand...

And I said I was the fan of transfers and standards, a few of my transfers are 100+ years old made by companies that have not made tools for 90 years.

I did post a picture of a transfer and no one noticed it, it was near a case extractor with a 30/06 case body attached; I did not explain how it worked because I did not want anyone passing out.

F. Guffey
 
Unclenick, posting pictures is a thankless job; there was a toggle switch in the back of the picture that escaped no ones notice; seems it was the only thing in the picture that did not belong in the picture. I had it set aside, a buider/reloader was having trouble with a bench grinder.

F. Guffey
 
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