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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
.408 Status???
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<blockquote data-quote="DANTEC" data-source="post: 22996" data-attributes="member: 685"><p>I made my own bullets on CNC lathe because cost of shipping from USA is hight and Custom papers are worth ( need a licence just to make a shipping for a trial on 10 bullets !!!! ) so I make my own .</p><p></p><p>I use as tolerance ( for long range bullets ) on drive band diameter +/- 0.005 mm so a total tolerance of 0.01 mm that make a tolerance of 0.000393 inch ( if I am OK with conversion ).</p><p></p><p>I check my bullet diameter with a MAHR micrometer 0 to 25 mm with a precision of 0.001 mm and check the MAHR micrometer with a gage block grade 1 and the roudness of the bullet with a MAHR gauge ( capacitive gauge ) on a V block MAHR give reading in the 0.0005 mm .</p><p></p><p>this range of tolerance is quite easy to get on semi mass product parts and on bronze parts ( because bronze have more dilatation that steel I need to keep the bullets in controled temperature room before to check the diameter ( just a too long time contact with my hands warm the bullet and diameter reading increase ).</p><p></p><p>I agree with Catshooter that the tolerance give on the 408 website is a tolerance of laboratory and at this level even your breath make the reading change . </p><p></p><p>for my bullet I use bronze alloy without nickel , just regular bronze bearing , what is the improvement of nickel alloy use in LRB bullets . because if you use to hard or too tought alloy you smash the barrel grooves and nickel alloy fouling is worth to remove . </p><p>that just a question because share informations in the first way to progress</p><p></p><p>enjoy engineering</p><p></p><p>DANTEC</p></blockquote><p></p>
[QUOTE="DANTEC, post: 22996, member: 685"] I made my own bullets on CNC lathe because cost of shipping from USA is hight and Custom papers are worth ( need a licence just to make a shipping for a trial on 10 bullets !!!! ) so I make my own . I use as tolerance ( for long range bullets ) on drive band diameter +/- 0.005 mm so a total tolerance of 0.01 mm that make a tolerance of 0.000393 inch ( if I am OK with conversion ). I check my bullet diameter with a MAHR micrometer 0 to 25 mm with a precision of 0.001 mm and check the MAHR micrometer with a gage block grade 1 and the roudness of the bullet with a MAHR gauge ( capacitive gauge ) on a V block MAHR give reading in the 0.0005 mm . this range of tolerance is quite easy to get on semi mass product parts and on bronze parts ( because bronze have more dilatation that steel I need to keep the bullets in controled temperature room before to check the diameter ( just a too long time contact with my hands warm the bullet and diameter reading increase ). I agree with Catshooter that the tolerance give on the 408 website is a tolerance of laboratory and at this level even your breath make the reading change . for my bullet I use bronze alloy without nickel , just regular bronze bearing , what is the improvement of nickel alloy use in LRB bullets . because if you use to hard or too tought alloy you smash the barrel grooves and nickel alloy fouling is worth to remove . that just a question because share informations in the first way to progress enjoy engineering DANTEC [/QUOTE]
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.408 Status???
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