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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet weight SD and when is it an issue?
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<blockquote data-quote="Trnelson" data-source="post: 1413748" data-attributes="member: 42308"><p>I haven't spent much time with the LRAB admittedly. I can report though that I saw very similar things when I first started working with the 143 ELDX. I first noticed unexplained velocity variations and fliers that I couldn't honestly attribute to my marksmanship. I'm mortal, not a YouTube expert or TV star, and readily accept and admit that once in a while I pull a shot or flinch or just have a crappy trigger squeeze. It happens. </p><p>I do everything I can do to give myself the best chance at success with the lowest SD I can get from my equipment. I do all my load workup and testing with a magnetospeed in place. It doesn't consider any of my mortal faults, or make me a better shooter, it just records exactly what the velocity was and what the ES and SD are. If a shot falls inside the SD but the impact isn't what I thought it should be it was likely me. If it's outside the normal SD it's maybe something else, and maybe still me. It's all history at that point, either you learn something from it or you don't. It slightly changes the POI but not the precision of the groups in my rifles. I don't hunt with it on, yet. </p><p>Once I sorted the bullets by weight and bearing surface the vast majority of those unexplained impacts went away and the SD settled in right where I expected it to be and has held steady. If I slip in one of the bullets that isn't within the lot I'm currently shooting it changes the velocity, sometimes a little and it doesn't really matter and sometimes enough that it shows up on the target.</p></blockquote><p></p>
[QUOTE="Trnelson, post: 1413748, member: 42308"] I haven’t spent much time with the LRAB admittedly. I can report though that I saw very similar things when I first started working with the 143 ELDX. I first noticed unexplained velocity variations and fliers that I couldn’t honestly attribute to my marksmanship. I’m mortal, not a YouTube expert or TV star, and readily accept and admit that once in a while I pull a shot or flinch or just have a crappy trigger squeeze. It happens. I do everything I can do to give myself the best chance at success with the lowest SD I can get from my equipment. I do all my load workup and testing with a magnetospeed in place. It doesn’t consider any of my mortal faults, or make me a better shooter, it just records exactly what the velocity was and what the ES and SD are. If a shot falls inside the SD but the impact isn’t what I thought it should be it was likely me. If it’s outside the normal SD it’s maybe something else, and maybe still me. It’s all history at that point, either you learn something from it or you don’t. It slightly changes the POI but not the precision of the groups in my rifles. I don’t hunt with it on, yet. Once I sorted the bullets by weight and bearing surface the vast majority of those unexplained impacts went away and the SD settled in right where I expected it to be and has held steady. If I slip in one of the bullets that isn’t within the lot I’m currently shooting it changes the velocity, sometimes a little and it doesn’t really matter and sometimes enough that it shows up on the target. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Bullet weight SD and when is it an issue?
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