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Rifles, Reloading, Optics, Equipment
Reloading
Ran into a problem with 338 Lapua
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<blockquote data-quote="Nimrodmar10" data-source="post: 623218" data-attributes="member: 36369"><p>I checked the seating stem for tip clearance. It has a hole drilled 1/4" beyond where the tip might hit, so that's not a problem.</p><p>I used the nut type comparator to measure the bullet from base to bearing surface. Out of a box of fifty Sierra 250 gr SMKs I found a difference from shortest to longest of 10 thousandths. The two largest groups that I measured and seperated into groups contained about 10 bullets each. The other 30 bullets were scattered to each extreme. I separated these into four groups of 5 each and loaded them. After I reloaded them I checked the comparator length of the shells and they measured the same. Conclusions: With the .005-.007" difference in the meplats (which I don't think matters) and the .010" difference in the bearing surface length (which I think does matter) it's hard to figure out what your COAL really is.</p><p></p><p>When checking the seating stem, I twisted the bullet several times to mark the bullet to see where it contacted the stem. It was contacting about half way between the point and full diameter. I think I'm going to use some scope ring lapping compound on a bullet to lap the stem to the correct contour. Anyone ever try this?</p></blockquote><p></p>
[QUOTE="Nimrodmar10, post: 623218, member: 36369"] I checked the seating stem for tip clearance. It has a hole drilled 1/4" beyond where the tip might hit, so that's not a problem. I used the nut type comparator to measure the bullet from base to bearing surface. Out of a box of fifty Sierra 250 gr SMKs I found a difference from shortest to longest of 10 thousandths. The two largest groups that I measured and seperated into groups contained about 10 bullets each. The other 30 bullets were scattered to each extreme. I separated these into four groups of 5 each and loaded them. After I reloaded them I checked the comparator length of the shells and they measured the same. Conclusions: With the .005-.007" difference in the meplats (which I don't think matters) and the .010" difference in the bearing surface length (which I think does matter) it's hard to figure out what your COAL really is. When checking the seating stem, I twisted the bullet several times to mark the bullet to see where it contacted the stem. It was contacting about half way between the point and full diameter. I think I'm going to use some scope ring lapping compound on a bullet to lap the stem to the correct contour. Anyone ever try this? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Ran into a problem with 338 Lapua
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