[_The_Shadow]

That's getting some good zip on those 155gr GD's...
Thanks for the great data Robert!

[robert91922]

You're welcome.
I am planning to compare these two 155gr/1500fps rounds in "5 waterbuckets test" this summer. It took several months to collect enough buckets, but then cold winter days came...I wouldn't test it before summer cause I expect some shower for shooter and cameraman as well

[robert91922]

After 2 batches w. N105/212gr hardcast (which were not so bad anyway) http://www.glocktalk.com/forums/show....php?t=1407651
... I decided to try a bit faster Vihtavuori 3N38. I found this powder to be more than ideal for 212gr hardcast bullets made by Target, Italy.
Here's ballistic data and equipment used:
- Glock 20 w. IGB 4.6" barrel, full supported
- DPM 3-spring system (stronger "silver" main spring)
- powder: Vihtavuori 3N38
- primers: CCI 300 Large Pistol
- brass: Starline, shot once in IGB barrel
- bullets: Target 212gr hardcast (HB/BHN 23)
http://www.targetbullets.it/hard-cas...ga_709223.html
- temp: 11°C (52°F)

load: 10.0gr COAL 1.261
1168
1161
1148
1160
1164
av. 1160 es 20.62 sd 7.48

load: 10.3gr COAL 1.263
1182
1171
1180
1186
1180
av. 1180 es 14.94 sd 5.47

load: 10.6gr COAL 1.263
1220
1203
1198
1196
1207
av. 1205 es 24.02 sd 9.48

load: 10.8gr COAL 1.267
1223
1201
1218
1216
1209
av. 1213 es 22.59 sd 8.54

load: 11.0gr COAL 1.270
1232
1225
1213
1222
1211
av. 1220 es 20.71 sd 8.66

load: 11.2gr COAL 1.271
1224
1229
1234
1241
1228
av. 1231 es 16.01 sd 6.48

load: 11.4gr COAL 1.273
1250
1246
1250
1232
1235
av. 1243 es 18.21 sd 8.54

All loads were very precise, no keyholing. If shooter (me) did his part of job a hole was in 8 - 10 points range at distance 25m (27 yards).
The only thing I dislike about these bullets is cleaning barrel aftermath. No significant lead fouling though, but spent a lot of time to clean it comparing to FMJ or JHP bullets.

P.S.:Beside my usual protecting equipment I was using LE riot helmet w. face shield as well. All went good, even primers flattened only to usual acceptable limits.

[whenmonkeysfly]

Thanks Robert! That is a big, fast 10mm!

[Jitterbug]

Nice work Robert! I may need to pick up a pound of that.

I visited the Vihtavuori website and couldn't find data for a 200 grain and Vihtavuori 3N38, where are you finding your data?

[robert91922]

Originally Posted by Jitterbug

Nice work Robert! I may need to pick up a pound of that.

I visited the Vihtavuori website and couldn't find data for a 200 grain and Vihtavuori 3N38, where are you finding your data?

Mostly here on GT and develop myself as well. So far I used 3N38 for lighter 10mm jacketed bullets, but hardcast bullets have less friction so after a bit too slow N105 I decided to give a try w. 3N38.
I guesstimated myself where to start from.
For the first time I got enhanced protection for loads testing - police riot helmet w. plastic shield covering a whole face. Better safe than sorry.

[whenmonkeysfly]

Originally Posted by robert91922

Better safe than sorry.

Absolutey! I have/will wear Kevlar gloves when testing hotter loads. Thanks for sharing the data.

-Jay

[Jitterbug]

Thanks Robert!

[_The_Shadow]

Robert, thanks for another fine report!

[SDGlock23]

Good to see some 3n38 info coming in. I haven't used it in the G20 yet but it does a stellar job with the 155 and 165gr .40's (only ones I've tested), so I suspect it should do great with 10mm too.

[robert91922]

Here's a link to my other thread, perhaps should be posted here in Vihtavuori powder data sticky. Anyway, to not be lost in many other threads, here you are:

http://www.glocktalk.com/forums/show....php?t=1432448

[robert91922]

Originally Posted by Jitterbug

Nice work Robert! I may need to pick up a pound of that.

I visited the Vihtavuori website and couldn't find data for a 200 grain and Vihtavuori 3N38, where are you finding your data?

I made my own last week

Here's ballistic data and equipment used:
- Glock 20 w. IGB 4.6" barrel, full supported
- DPM 3-spring system (weaker "yellow" main spring)
- powder: Vihtavuori 3N38
- primers: CCI 300 Large Pistol
- brass: Starline & Winchester, shot once in IGB barrel
- bullets: Hornady FMJ 200 gr
- temp: 27°C (81°F)

load: 10.0gr COAL 1.269
1120, 1049, 1109, 1108, 1122, 1121
av. 1105

load: 10.6gr COAL 1.269
1189, 1179, 1169, 1168, 1156, 1169
av. 1168

load: 10.9gr COAL 1.269
1190, 1192, 1193, 1189, 1206, 1196, 1190
av. 1194

load: 11.2gr COAL 1.269
1218, 1210, 1206, 1207, 1209, 1194, 1213
av. 1208

load: 11.4gr COAL 1.270
1243, 1241, 1231, 1240, 1240, 1243, 1242
av. 1240 es 12.53 sd 4.12

load: 11.6gr COAL 1.270
1246, 1241, 1246, 1241, 1235, 1242, 1228
av. 1240 es 17.12 sd 6.40

load: 11.8gr COAL 1.270
1262, 1264, 1248, 1266, 1255, 1256
av. 1259 es 17.64 sd 6.16

load: 12.0gr COAL 1.270
1271, 1272, 1266, 1265, 1258, 1255
av. 1265 es 16.36 sd 6.70


Mags were reinforced w. Arredondo springs, so no more slide overriding over the next round. Worked flawlessly.
warning: Don't try this at home! Go to the range

[RDub01]

Hi

Shot some 180gr Speer TMJ's through a G20-SF with 3N38 powder.


Glock 20SF with factory barrel and spring
Rounds were seated to 1.26” COL
Circles are 5½” at 25 yards
Shooting was done off of a Caldwell Pistol Rest
Velocities taken with an Oehler Mod 33 chronograph. Skyscreens centered 8’ from muzzle.





Data on targets;

Average velocity
Velocity spread
Standard deviation
temperature

Case head expansion;
11.3grs is about max in this gun, maybe a bit less in warmerweather.
I had an erroneous chrono reading on the 11.3gr string thatI didn’t catch, which screwed up the average, but I recall seeing velocities inthe low 1200’s
10.4grs minimal expansion
10.7grs .4335,.4335, .4335, .4330, .4336
11.0grs .4339, .4335, .4336, .4337, .4336
11.3grs .4340,.4338, .4339, .4340, .4342
11.6grs .4339,.4346, .SMILEY, .4345, .4339

I don't know why the groups were so far left and high..

[RDub01]

Hi
Shot some 180gr SpeerTMJ's through a G20-SF with N-105 powder.
Glock 20SF with factory barrel and spring
Rounds were seated to 1.26” COL
Circles are 5½” at 25 yards
Shooting was done off of a Caldwell Pistol Rest
Velocities taken with an Oehler Mod 33 chronograph. Skyscreens centered 8’ from muzzle.






11.1grs was somewhat compressed with the Speer 180 TMJ and12.0grs was even more so. N-105 is an extruded powder and it doesn’t meter as well as some others.
11.1grs produced a not so great group.. It would seem N-105 doesn't like to be loaded down..
11.7grs is as far as I want to go here with this gun.. 12.0grs gave head expansion larger than I want to go.
Both 3N38 and N-105 maxed out at about 1200 fps in the factory barrel.

11.1grs .4334,.4334, .4332, .4340, .4330
11.4grs .4336,.4337, .4339, .4332, .4335
11.7grs .4336,.4344, .4340, .4336, .4341
12.0grs .4342,.4346, .4344, .4345, .4336

Not sure why the groups were so far left and high..