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Cas City Forum Hall & CAS-L  |  CAS TOPICS  |  The Darksider's Den (Moderator: Cuts Crooked)  |  Topic: Measuring BP, weight vs. volume 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Measuring BP, weight vs. volume  (Read 1110 times)
El Paso Pete
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« on: October 30, 2005, 06:08:02 am »

Here is what one shooter found out when changing from one lot of Swiss to another.

More in the density saga:  45-90.
 
75 gr by weight of the old lot =  1264 avg velocity, about 2 MOA
 
Same volume of the newer stuff, (68 gr weight) gave 1181,  all over the paper
 
75 by weight of new stuff = 1266, and 2 MOA again.  AHA!
 
Postell bullet, 528 gr, 20-1, .030 veggie wad, Black Magic lube, Fed 215, BA brass for all of them.
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Steel Horse Bailey
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« Reply #1 on: October 30, 2005, 08:35:55 am »
Yep, it changes, but I didn't think it would change THAT much from one lot to another!
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« Reply #2 on: November 04, 2005, 09:09:06 pm »
IT'S THE MASS OF POWDER THAT PRODUCES THE ENERGY.  MASS IS VOLUME X DENSITY.  COMPRESSION INCREASES DENSITY.

WITH BP, ENERGY IS VERY CONSISTANT WHEN THE POWDER MASS IS CONSISTANT.

DD-DLoS
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Cas City Forum Hall & CAS-L  |  CAS TOPICS  |  The Darksider's Den (Moderator: Cuts Crooked)  |  Topic: Measuring BP, weight vs. volume « previous next »
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