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Rifles, Reloading, Optics, Equipment
Gunsmithing
Tight freebore in Tikka factory barrel
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<blockquote data-quote="VinceMule" data-source="post: 3061972" data-attributes="member: 122164"><p>It would be an interesting discussion on fat bullets vs skinny bullets, barrel inside dia, Harmonics, and throat dia.</p><p></p><p>Some gunsmiths have a set of reamer pilots for each caliber, they determine what the bore dia is with the reamer pilots that are graduated in .0001-.0002 sets, or they use Deltronic pins. It would be nice if the gunsmith were to stamp on the outside of the barrel the dia of the reamer pilot they used. There used to be a gunsmith in Tenn. that did this on every barrel, he has passed on now. Knowing the inside dia of the bore gives you a leg up on which bullets may work the best, as a best guess only.</p><p></p><p>As bullet making dies wear, bullets get fatter. Barrels will like what they like, no getting around it. Throat dia vs fat bullets is a must know situation. If the shank on a new lot# of the same bullet gets .0003 fatter than the same bullet you worked up a load with, your groups will go to pot.</p><p></p><p>As you get older, a Mechanical Digital Micrometer is much easier to read, and you are much less apt to make a mistake. Here is an example of an excellent Mechanical Digital Micrometer that some are probably not familiar with, this is not mine in the auction,to illustrate only.</p><p></p><p>Check ebay: <strong>Mitutoyo digital,vernier micrometer 0-1".0001".Machinist tool.</strong></p></blockquote><p></p>
[QUOTE="VinceMule, post: 3061972, member: 122164"] It would be an interesting discussion on fat bullets vs skinny bullets, barrel inside dia, Harmonics, and throat dia. Some gunsmiths have a set of reamer pilots for each caliber, they determine what the bore dia is with the reamer pilots that are graduated in .0001-.0002 sets, or they use Deltronic pins. It would be nice if the gunsmith were to stamp on the outside of the barrel the dia of the reamer pilot they used. There used to be a gunsmith in Tenn. that did this on every barrel, he has passed on now. Knowing the inside dia of the bore gives you a leg up on which bullets may work the best, as a best guess only. As bullet making dies wear, bullets get fatter. Barrels will like what they like, no getting around it. Throat dia vs fat bullets is a must know situation. If the shank on a new lot# of the same bullet gets .0003 fatter than the same bullet you worked up a load with, your groups will go to pot. As you get older, a Mechanical Digital Micrometer is much easier to read, and you are much less apt to make a mistake. Here is an example of an excellent Mechanical Digital Micrometer that some are probably not familiar with, this is not mine in the auction,to illustrate only. Check ebay: [B]Mitutoyo digital,vernier micrometer 0-1".0001".Machinist tool.[/B] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Tight freebore in Tikka factory barrel
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