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Old April 23, 2005, 01:36 PM   #1
shu
Senior Member
 
Join Date: May 11, 2000
Location: lower rio grande valley, texas
Posts: 216
powder weight, oal, charts, and more

found a free (gpl) program called 'graph' at
http://padowan.dk/graph/

tuned it to plot range of powder weight at given o.a.l., as given by various sources of load data.

two objectives are:
..visual presentation for comparison of data from various sources;
..identify set of points (o.a.l. and powder weight) for test loads.

for this purpose, treated as equal all bullets of near-same-weight and identical bearing surface. (e.g. 9mm bullets of 124 to 125 gr weight and copper jacket would be included, regardless if source recipe were for jhp, jsp, fmj, etc.)

where data source specified only a max powder load, i used 0.9*max as the starting load.

indeed, as one would hope to see, those powder ranges on the heavy side also specified longer o.a.l. (and vice-versa). i expect the plots to visually define an envelope within which to work.
Attached Images
File Type: bmp 9mm_125jac_tightgp.bmp (41.8 KB, 38 views)
File Type: bmp 9mm_125jac_powrpis.bmp (52.7 KB, 7 views)
File Type: bmp 9mm_125jac_bluedot.bmp (52.5 KB, 9 views)
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Last edited by shu; April 23, 2005 at 02:20 PM.
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