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AB3006 said:
The pressure that generates enough force to launch the bullet is lower than the maximum possible pressure from all the powder being burned in the casing. This is why powder still burns in the barrel , since the bullet is already accelerating down the bore.

If the powder has a slow enough rate of burn, and the barrel is short enough, the bullet will leave the muzzle before complete combustion, and unburnt/burning powder will be ejected behind it. This means that you get incomplete energy transfer, and therefore don't achieve max MV and waste powder.
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As per the infographic in post #1, all powder is burned by the time the bullet is 5" down the barrel - this is inconsistent with what you have written here. One of you is wrong.
 
peterdobson said:
The graph was made by VihtaVuori engineers from actual test data.

Regards,

Peter
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peterdobson said:
The graph was made by VihtaVuori engineers from actual test data.

Regards,

Peter
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A pressure and velocity trace with no scales for pressure or velocity; a conclusion in the left margin that doesn’t make sense for pressure or velocity and a list of variables that aren’t even on the chart in the right margin. Actually that does sound like something an engineer would do😂.
 
adamg said:
As per the infographic in post #1, all powder is burned by the time the bullet is 5" down the barrel - this is inconsistent with what you have written here. One of you is wrong.
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This is why i said that there's likely little difference between a 16" and 24" barrel, as per the infographic. However, a slow burning powder in a 5 or 6" pistol barrel may run into the situation I described. So, no, I don't see an inconsitency.
 
Dogleg said:
A pressure and velocity trace with no scales for pressure or velocity; a conclusion in the left margin that doesn’t make sense for pressure or velocity and a list of variables that aren’t even on the chart in the right margin. Actually that does sound like something an engineer would do😂.
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It's likely that the chart was originally in relative units, to compare pressure and velocity directly.

However, none of that is indicated, and neither is the x scale - time, position in the barrel, a relative scale of the two??
 
AB3006 said:
It's likely that the chart was originally in relative units, to compare pressure and velocity directly.

However, none of that is indicated, and neither is the x scale - time, position in the barrel, a relative scale of the two??
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I think the sales promotion guy got ahold of a generic pressure trace chart and threw a bunch of words at it that weren’t even in English originally😂 Then gave it to his secretary to finish.
It’s not unusal for sales to just say things that they think sound good. A totally unrelated example is the sales info given on the old Weatherby Vanguards about their triggers. For years you couldn’t peruse their description without being told that the sear had .013” engagement . I doubt that anyone every drew a deep sigh of relief and said “Well finally someone got the right amount of that!!”
 
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Dogleg said:
I think the sales promotion guy got ahold of a generic pressure trace chart and threw a bunch of words at it that weren’t even in English originally😂 Then gave it to his secretary to finish.
It’s not unusal for sales to just say things that they think sound good. A totally unrelated example is the sales info given on the old Weatherby Vanguards about their triggers. For years you couldn’t peruse their description without being told that the sear had .013” engagement . I doubt that anyone every drew a deep sigh of relief and said “Well finally someone got the right amount of that!!”
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To quote Terry Pratchett, it was translated from Japanese into Swedish by a Korean rice husker.
 
There is nothing in the graph to support the faster powder shorter barrel comment, it looks like some person for some reason stuck that on there erroneously without the input of the graph makers. The comment presents as almost a summary for the graph, I don't think the graph makers made it, it doesn't even say what is the benefit of the faster powder
 
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