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Rifles, Reloading, Optics, Equipment
Reloading
Bullet Sorting – Weight vs BTO vs BS
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<blockquote data-quote="Greyfox" data-source="post: 1520167" data-attributes="member: 10291"><p>While I will always check(and adjust my load if necessary) OL, BTO, BS, and weight with a lot change with the same barrel, my sorting days pretty much ended when I began using Berger's and JLK's. As an aside, I just received a long backordered delivery of Berger 140 HVLD's. Being curious if the plant move could have effected production quality, I ran measurements. The variations on BTO and BS were amazingly tight, all within .001" !!! I stopped measuring after about 50 bullets. For those that may have noticed, there was a BC change for these bullets a while back: G7 .313 to G7 .307. While this change is not much, I might speculate that this is because the .307 BC bullets in this new lot, compared to my older BC .313 samples, are as much as .030" shorter in OL, and, the bearing surface, .010"-.020" shorter. BTO is within .010"(generally the case with Bergers when testing lot to lot). As usual, bullet weights are most all at 140gr with an occasional +/- .1gr. </p><p>Actual testing at 200 yards of this new lot produces comparable accuracy, velocity, and ES to prior lots in the same barrel/load. I still need to check the BC/POI with some 1000 yard testing.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1520167, member: 10291"] While I will always check(and adjust my load if necessary) OL, BTO, BS, and weight with a lot change with the same barrel, my sorting days pretty much ended when I began using Berger’s and JLK’s. As an aside, I just received a long backordered delivery of Berger 140 HVLD’s. Being curious if the plant move could have effected production quality, I ran measurements. The variations on BTO and BS were amazingly tight, all within .001” !!! I stopped measuring after about 50 bullets. For those that may have noticed, there was a BC change for these bullets a while back: G7 .313 to G7 .307. While this change is not much, I might speculate that this is because the .307 BC bullets in this new lot, compared to my older BC .313 samples, are as much as .030” shorter in OL, and, the bearing surface, .010”-.020” shorter. BTO is within .010”(generally the case with Bergers when testing lot to lot). As usual, bullet weights are most all at 140gr with an occasional +/- .1gr. Actual testing at 200 yards of this new lot produces comparable accuracy, velocity, and ES to prior lots in the same barrel/load. I still need to check the BC/POI with some 1000 yard testing. [/QUOTE]
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Reloading
Bullet Sorting – Weight vs BTO vs BS
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