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Rifles, Reloading, Optics, Equipment
Reloading
Developing Load for 168 Berger New Brass vs Once Fired
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<blockquote data-quote="Bart B" data-source="post: 656255" data-attributes="member: 5302"><p>Use either a CUP or PSI measuring system as that's the best and most accurate way but it comes at a high price. Looking at primers and cases for expansion or deforming issues is not all that good as both have different hardness numbers and won't show the same indications for a given amount of pressure. Primer and case indicators read by a trained eye are just a rough guess, but work well if one's conservative and not power and velocity hungry.</p><p></p><p>Second best is to get SAAMI spec reference ammunition from ammo companies; SAAMI's web site lists companys that make them. </p><p></p><p><a href="http://www.saami.org/specifications_and_information/publications/download/206.pdf" target="_blank">http://www.saami.org/specifications_and_information/publications/download/206.pdf</a></p><p></p><p>They're precision loaded to give SAAMI spec pressure in a standard SAAMI spec pressure test barrel. When fired in a consumer's rifle, the case and primer indications will show what those two specific items indicate the pressure is. That pressure may be lower in your barrel that a SAAMI spec test barrel, but at least it's a very good indicator to use the same make of primer and case to load your own ammo.</p><p></p><p>Yes, but the pressure is pretty close. I don't think it's worth that barrel's life to find a load that matches SAAMI (or some other) specs. If you're 50 fps off, that's going to mean only a 10 to 15 inch drop difference at 1000 yards.</p><p></p><p>Yes, but the peak pressure may still be higher that SAAMI spec depending on the powder charge used, bullet to bore fit, case neck tension and primer used. There's a bunch of variables at hand.</p><p></p><p>No competitor cares if muzzle velocity is off some cartridge "specification" by 50 (or for the most part, even 100) fps. They don't care about winning the race to the target. They just want their bullets to land close together. No hunter nor game animal will tell the difference at any range with a bullet leaving the barrel with the same difference from "specifications" say. Even the best wildlife forensic expert would be hard pressed to tell the difference.</p><p></p><p>At least, this is my opinion. Others can set their own standards depending on what they must have.</p></blockquote><p></p>
[QUOTE="Bart B, post: 656255, member: 5302"] Use either a CUP or PSI measuring system as that's the best and most accurate way but it comes at a high price. Looking at primers and cases for expansion or deforming issues is not all that good as both have different hardness numbers and won't show the same indications for a given amount of pressure. Primer and case indicators read by a trained eye are just a rough guess, but work well if one's conservative and not power and velocity hungry. Second best is to get SAAMI spec reference ammunition from ammo companies; SAAMI's web site lists companys that make them. [url]http://www.saami.org/specifications_and_information/publications/download/206.pdf[/url] They're precision loaded to give SAAMI spec pressure in a standard SAAMI spec pressure test barrel. When fired in a consumer's rifle, the case and primer indications will show what those two specific items indicate the pressure is. That pressure may be lower in your barrel that a SAAMI spec test barrel, but at least it's a very good indicator to use the same make of primer and case to load your own ammo. Yes, but the pressure is pretty close. I don't think it's worth that barrel's life to find a load that matches SAAMI (or some other) specs. If you're 50 fps off, that's going to mean only a 10 to 15 inch drop difference at 1000 yards. Yes, but the peak pressure may still be higher that SAAMI spec depending on the powder charge used, bullet to bore fit, case neck tension and primer used. There's a bunch of variables at hand. No competitor cares if muzzle velocity is off some cartridge "specification" by 50 (or for the most part, even 100) fps. They don't care about winning the race to the target. They just want their bullets to land close together. No hunter nor game animal will tell the difference at any range with a bullet leaving the barrel with the same difference from "specifications" say. Even the best wildlife forensic expert would be hard pressed to tell the difference. At least, this is my opinion. Others can set their own standards depending on what they must have. [/QUOTE]
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Developing Load for 168 Berger New Brass vs Once Fired
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