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Rifles, Reloading, Optics, Equipment
Reloading
Calculating Chamber Pressure
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<blockquote data-quote="Ridgerunner665" data-source="post: 1002361" data-attributes="member: 12660"><p>Copied and pasted from a post of mine on another forum...didn't wanna retype it all...covers a couple of questions asked.</p><p></p><p></p><p></p><p>QuickLoad is very good at what it does...but its not perfect (nothing is)...powder burn rates vary from lot to lot, thats just a fact of life.</p><p></p><p> Thats why everything is adjustable in QL...one example I've came across...Norma MRP powder, QL says it heat of explosion is 4,020...Norma says its 3,873...bulk density doesn't match either (I forget the numbers for that one)...those things greatly affect the outcome, on the order of 5 grains difference in a 280 Ackley...which one is right? Probably both (or neither one, depending on how you look at it)...for the same reason we have to start over with a new lot of powder...no 2 lots are exactly the same...and also, the different lots were tested on different equipment.</p><p></p><p>Until there is a powder that is the exact same in every round and for every lot...QuickLoad is the best we have...not knocking pressure trace, they both have their place and do what they are designed to do....but neither of them are a "1 click" simple fix...both require some groundwork.</p><p></p><p>As to the semantics of the question that was asked....in my opinion...QL "calculates" chamber pressure based on powder burn characteristics that have been measured in sophisticated equipment.</p><p></p><p>Pressure trace "measures" chamber pressure...but it too is relying on off site measurements to make its magic...that being, the strength of the steel...which also varies some from lot to lot.</p><p></p><p>Neither system can be 100% right all the time...both can be very close most of the time (with proper specific input)</p></blockquote><p></p>
[QUOTE="Ridgerunner665, post: 1002361, member: 12660"] Copied and pasted from a post of mine on another forum...didn't wanna retype it all...covers a couple of questions asked. QuickLoad is very good at what it does...but its not perfect (nothing is)...powder burn rates vary from lot to lot, thats just a fact of life. Thats why everything is adjustable in QL...one example I've came across...Norma MRP powder, QL says it heat of explosion is 4,020...Norma says its 3,873...bulk density doesn't match either (I forget the numbers for that one)...those things greatly affect the outcome, on the order of 5 grains difference in a 280 Ackley...which one is right? Probably both (or neither one, depending on how you look at it)...for the same reason we have to start over with a new lot of powder...no 2 lots are exactly the same...and also, the different lots were tested on different equipment. Until there is a powder that is the exact same in every round and for every lot...QuickLoad is the best we have...not knocking pressure trace, they both have their place and do what they are designed to do....but neither of them are a "1 click" simple fix...both require some groundwork. As to the semantics of the question that was asked....in my opinion...QL "calculates" chamber pressure based on powder burn characteristics that have been measured in sophisticated equipment. Pressure trace "measures" chamber pressure...but it too is relying on off site measurements to make its magic...that being, the strength of the steel...which also varies some from lot to lot. Neither system can be 100% right all the time...both can be very close most of the time (with proper specific input) [/QUOTE]
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Calculating Chamber Pressure
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