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Rifles, Reloading, Optics, Equipment
Reloading
Overpressure Signs ?
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<blockquote data-quote="Kennibear" data-source="post: 952126" data-attributes="member: 51650"><p>Semtex</p><p>"I guess I am going to go out on a limb here and say this...if you look at just about any reloading manual notice that most calipers tend to start decreasing drastically after 200 yards...you can't beat gravity its just something you have to live with."</p><p></p><p>Let me introduce you to the 22-250. 3600fps with a 55gr 22 cal. bullet is laser flat to 400 yards. Try the Hornady 53gr V-Max pushed to 3900fps by a max load of CFE223. Sighted at 300 yards it does not rise more than 3" (2.9" 2 175yds) and drops only 7.2" at 400 yards. At a quarter of a mile (440 yds) it is down 12"/1'. How flat is your flat?</p><p></p><p>Back to pressure. When Oehler came out with the M43 PBL (Personal Ballistics Laboratory) I though Heaven had kissed the earth. At least for a couple of thousand dollars you could get a peck on the cheek. Pressure was by guess and by golly prior to that. The Pressure Trace II has moved the cost down another notch or two as the complete set <em><strong>with</strong></em> a CED M2 chronograph ships for around $1k. These two instruments move pressure from a good guess from visuals of a fired case to solid data on the computer screen. $1k is the price of a quality scope.</p><p></p><p>I am as good as anyone at reading pressure from a case and primer. Two years ago I went digital.</p><p></p><p>KB</p></blockquote><p></p>
[QUOTE="Kennibear, post: 952126, member: 51650"] Semtex "I guess I am going to go out on a limb here and say this...if you look at just about any reloading manual notice that most calipers tend to start decreasing drastically after 200 yards...you can't beat gravity its just something you have to live with." Let me introduce you to the 22-250. 3600fps with a 55gr 22 cal. bullet is laser flat to 400 yards. Try the Hornady 53gr V-Max pushed to 3900fps by a max load of CFE223. Sighted at 300 yards it does not rise more than 3" (2.9" 2 175yds) and drops only 7.2" at 400 yards. At a quarter of a mile (440 yds) it is down 12"/1'. How flat is your flat? Back to pressure. When Oehler came out with the M43 PBL (Personal Ballistics Laboratory) I though Heaven had kissed the earth. At least for a couple of thousand dollars you could get a peck on the cheek. Pressure was by guess and by golly prior to that. The Pressure Trace II has moved the cost down another notch or two as the complete set [I][B]with[/B][/I] a CED M2 chronograph ships for around $1k. These two instruments move pressure from a good guess from visuals of a fired case to solid data on the computer screen. $1k is the price of a quality scope. I am as good as anyone at reading pressure from a case and primer. Two years ago I went digital. KB [/QUOTE]
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Overpressure Signs ?
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