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Hunting
Long Range Hunting & Shooting
338 Allen Xpress, RL33 load development
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<blockquote data-quote="Fiftydriver" data-source="post: 863278" data-attributes="member: 10"><p>In the past, I have found that when using modern high performance stick powders, temp really was not the biggest factor in variation with muzzle velocity and chamber pressures. It has always seemed that elevation had a larger effect on chamber pressure which comes down to bar pressure. I have not tested this ALOT as its more difficult to do testing at a wide range of elevations but on several occasions, I had developed top end loads at my 3400 ft elevation and then took the same loads up on a camping trip to an elevation of around 7000 ft and would see more pressure signs even in cooler temps.....</p><p> </p><p>Not dramatically higher but they seemed to produce more chamber pressure at higher elevation and I can not really explain why exactly.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 863278, member: 10"] In the past, I have found that when using modern high performance stick powders, temp really was not the biggest factor in variation with muzzle velocity and chamber pressures. It has always seemed that elevation had a larger effect on chamber pressure which comes down to bar pressure. I have not tested this ALOT as its more difficult to do testing at a wide range of elevations but on several occasions, I had developed top end loads at my 3400 ft elevation and then took the same loads up on a camping trip to an elevation of around 7000 ft and would see more pressure signs even in cooler temps..... Not dramatically higher but they seemed to produce more chamber pressure at higher elevation and I can not really explain why exactly. [/QUOTE]
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338 Allen Xpress, RL33 load development
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