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Rifles, Reloading, Optics, Equipment
Reloading
Bullet Seating Depth
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<blockquote data-quote="Shootin4fun" data-source="post: 976961" data-attributes="member: 28741"><p>Ah ha! This is what I have just discovered. I have never compared the ogive measurement between bullets of the same make/model before until today when I was loading up a batch of 130gr SSTs for my 270win. I found an accurate load a few weeks ago and am confirming and trying to replicate it. This batch was about to bridge 2 boxes of SSTs so for the heck of it I started measuring ogive to bullet base to see if there is a difference. INDEED there is. (Great, another variable to measure and sort!)</p><p></p><p>Lo and behold, there were 3 basic base to ogive lengths each: ~1.280,</p><p>~1.285, and ~1.290". Holy smokes that's an extreme spread of .010! 50% were at the longest end. (Also, the shorter ogive bullets were shorter end to end by approximately the same amount.) This means that the longest could potentially be seated .010 deeper into the case than the shortest ones since the die always contacts the bullet at the same circumference. Now I'm assuming for a moment that the jump to the lands remains the same because presumably the seating die hits the bullet at the same point on the ogive each time (just to keep considerations simple). There was no correlation in weight differences to length differences. </p><p></p><p>So my big question is, how much will the variation of .010" into the case affect pressure/burn, considering we are changing the case capacity? </p><p></p><p>Does this count more than a variation in jump of .010?? My guess is no, but it still matters.</p><p></p><p>If I found an accurate length/charge for the longest ones, how should I compensate for the difference when loading up the shorter ones. Should I seat the shorter ones .010 shallower? Conversely if the accurate load is with shorter ones, should I seat the longer ones deeper?</p><p></p><p>BTW, this is a hunting gun (Browning BAR) not a BR gun, and my best loads often give me 3 of 4 in a clover leaf, and 1 flier .2 - .8" away @ 100. I have never figured out if the flier is me or the load. But as mentioned above, I want to develop the tightest load possible so variance in the field is due to me and external factors.</p><p></p><p>Thanks in advance for any sage advice y'all have to offer.</p></blockquote><p></p>
[QUOTE="Shootin4fun, post: 976961, member: 28741"] Ah ha! This is what I have just discovered. I have never compared the ogive measurement between bullets of the same make/model before until today when I was loading up a batch of 130gr SSTs for my 270win. I found an accurate load a few weeks ago and am confirming and trying to replicate it. This batch was about to bridge 2 boxes of SSTs so for the heck of it I started measuring ogive to bullet base to see if there is a difference. INDEED there is. (Great, another variable to measure and sort!) Lo and behold, there were 3 basic base to ogive lengths each: ~1.280, ~1.285, and ~1.290". Holy smokes that's an extreme spread of .010! 50% were at the longest end. (Also, the shorter ogive bullets were shorter end to end by approximately the same amount.) This means that the longest could potentially be seated .010 deeper into the case than the shortest ones since the die always contacts the bullet at the same circumference. Now I'm assuming for a moment that the jump to the lands remains the same because presumably the seating die hits the bullet at the same point on the ogive each time (just to keep considerations simple). There was no correlation in weight differences to length differences. So my big question is, how much will the variation of .010" into the case affect pressure/burn, considering we are changing the case capacity? Does this count more than a variation in jump of .010?? My guess is no, but it still matters. If I found an accurate length/charge for the longest ones, how should I compensate for the difference when loading up the shorter ones. Should I seat the shorter ones .010 shallower? Conversely if the accurate load is with shorter ones, should I seat the longer ones deeper? BTW, this is a hunting gun (Browning BAR) not a BR gun, and my best loads often give me 3 of 4 in a clover leaf, and 1 flier .2 - .8" away @ 100. I have never figured out if the flier is me or the load. But as mentioned above, I want to develop the tightest load possible so variance in the field is due to me and external factors. Thanks in advance for any sage advice y'all have to offer. [/QUOTE]
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