Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bore Scope Chamber Question
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="QuietTexan" data-source="post: 2412986" data-attributes="member: 116181"><p>If it's concentric (and it's fuzzy but looks like it generally is) then that's normal.</p><p></p><p>The pictures create an optical illusion - Pic three shows the concentric reamer cut that ramps into the lands. Pics 1 and 2 show the difference in bore and groove diameter, but the poor depth of field created by essentially no lens in the borescope isn't showing the relative change in the heights of the lands so it looks like the lands aren't cut.</p><p></p><p>The reamer is cutting down two different diameters - .264 groove diameter but also .256 bore diameter, so the lands are 0.004" taller than the groove. Super high tech picture:</p><p>[ATTACH=full]332880[/ATTACH]</p><p></p><p>The unevenness on the upper left side of the 4th picture looks like there's a higher than normal spot in the barrel next to the land, which is probably a result of a wear on the button that rifled the barrel. You're cutting down a bore that is not a perfectly uniform circle but rather slightly hexagonal (because of wear on the outer radius of the button) so there should be a uniformly uncut portion along each side of the lands that gets narrower until the new major diameter is completely cutting out the grooves.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2412986, member: 116181"] If it's concentric (and it's fuzzy but looks like it generally is) then that's normal. The pictures create an optical illusion - Pic three shows the concentric reamer cut that ramps into the lands. Pics 1 and 2 show the difference in bore and groove diameter, but the poor depth of field created by essentially no lens in the borescope isn't showing the relative change in the heights of the lands so it looks like the lands aren't cut. The reamer is cutting down two different diameters - .264 groove diameter but also .256 bore diameter, so the lands are 0.004" taller than the groove. Super high tech picture: [ATTACH type="full" alt="bore angle.JPG"]332880[/ATTACH] The unevenness on the upper left side of the 4th picture looks like there's a higher than normal spot in the barrel next to the land, which is probably a result of a wear on the button that rifled the barrel. You're cutting down a bore that is not a perfectly uniform circle but rather slightly hexagonal (because of wear on the outer radius of the button) so there should be a uniformly uncut portion along each side of the lands that gets narrower until the new major diameter is completely cutting out the grooves. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bore Scope Chamber Question
Top