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Old 10-25-2004, 20:27   #29
kestrou
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OK Gang, I've got the complete spectrum of Vihta Vouri N340 worked out for 10mm 155Gr FMJ - complete with graph!

The following data was all chronyed in a single range session at 75 degres through a stock Glock 20 (4.6" barrel) with a Pact Mark IV. Bullets are all 155gr West Coast Truncated Cone, with COL of 1.260", primers are CCI. The data is based on 6-shot samples (throwing no data out as fliers).

Grains FPS FPE PowerFactor
5.4 867.33 258.98 134.44
5.6 868.67 259.77 134.64
5.8 904.33 281.54 140.17
6.0 928.67 296.90 143.94
6.2 967.50 322.25 149.96
6.4 1033.33 367.59 160.17
6.6 1030.00 365.23 159.65
6.8 1054.50 382.81 163.45
7.0 1079.67 401.30 167.35
7.2 1123.33 434.42 174.12
7.4 1162.83 465.50 180.24
7.6 1171.83 472.74 181.63
7.8 1208.83 503.06 187.37
8.0 1218.00 510.72 188.79
8.2 1233.17 523.52 191.14
8.4 1246.33 534.76 193.18
8.6 1263.33 549.44 195.82
8.8 1297.50 579.57 201.11
9.0 1302.33 583.89 201.86
9.2 1333.50 612.17 206.69

Here's a graph on the Grains vs. FPS, FPE, & PF:

10mm Reloading Forum
For some stinking reason the image won't embed - have to just link to it - sorry!

At the low end, the slide on my G-20 still cycled reliably, but it's had over 20K rounds through it and the recoil spring is definitely ready for replacement. On the high end, I could definitely start to see the imprint of the firing pin channel in the primer, but they weren't noticeably flattening out yet and there was no sign of "smilies".

Having said that: As always, the following Disclaimer applies to this reloading data (and any other you may find published here on GT, or anywhere!): "This worked in one person's gun, and might not work in yours. Start low and work up at your own risk!"

kestrou
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