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Rifles, Reloading, Optics, Equipment
Reloading
Chamber pressures
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<blockquote data-quote="MNbogboy" data-source="post: 750852" data-attributes="member: 18849"><p>Big Wally,</p><p>This has turned into a bit of a gunsmithing thread...All is good in your proposal to obtain your desired result...Except that facing off just enough off the shoulder to obtain exactly one turn may not be quite that easy....Depending on your thread pitch ( I am assuming about approx 1:16) that means that 1 degree of rotation would require a .00017 inch depth of cut...This would mean you would not have much room for error regarding the extractor slot...If you miss this in your final cut then the alternative might be to widen the extractor slot or make a deeper shoulder cut and grind a custom spacer with a surface grinder...Also you may have to deepen that extractor slot.</p><p></p><p>Facing off the breech end for your new rim space will give you that .060/.063 extra you are looking for.....The K hornet reamer should clean it up nice...Make sure you get the throat you ask for....</p><p></p><p>Back to our discussion on pressures and seating depth...The hornet family is a perfect example of pressure rising with increasing with deep seating because it is a low volume case to begin with....I have seen this happen in my .221 fireball while looking for optimum seating.....We all realize now your concern was what will pressures do when loaded at the lands and with deeper seating the answer is yes they will increase for both reasons...(at least till someone proves otherwise I am pretty sure Mikecr will agree)!</p><p></p><p>Also thank you for the compliment, my days of being a lad left me long ago....I have been hand loading for near 50 years now and I fit my first barrel 40 something years ago...I too joined this thread to learn from these "lads".....There is a lot of good talent on here and a ton of information.....</p><p></p><p>Good luck on your project,</p><p>Randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 750852, member: 18849"] Big Wally, This has turned into a bit of a gunsmithing thread...All is good in your proposal to obtain your desired result...Except that facing off just enough off the shoulder to obtain exactly one turn may not be quite that easy....Depending on your thread pitch ( I am assuming about approx 1:16) that means that 1 degree of rotation would require a .00017 inch depth of cut...This would mean you would not have much room for error regarding the extractor slot...If you miss this in your final cut then the alternative might be to widen the extractor slot or make a deeper shoulder cut and grind a custom spacer with a surface grinder...Also you may have to deepen that extractor slot. Facing off the breech end for your new rim space will give you that .060/.063 extra you are looking for.....The K hornet reamer should clean it up nice...Make sure you get the throat you ask for.... Back to our discussion on pressures and seating depth...The hornet family is a perfect example of pressure rising with increasing with deep seating because it is a low volume case to begin with....I have seen this happen in my .221 fireball while looking for optimum seating.....We all realize now your concern was what will pressures do when loaded at the lands and with deeper seating the answer is yes they will increase for both reasons...(at least till someone proves otherwise I am pretty sure Mikecr will agree)! Also thank you for the compliment, my days of being a lad left me long ago....I have been hand loading for near 50 years now and I fit my first barrel 40 something years ago...I too joined this thread to learn from these "lads".....There is a lot of good talent on here and a ton of information..... Good luck on your project, Randy [/QUOTE]
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