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Old 03-04-2010, 15:23   #11
Gun-adian
Member
 
Join Date: Nov 2009
Location: British Columbia on the 49th
Posts: 28
Hey again, everyone.

I made a second trip to the range to wring out more of my 6 inch 9x25 Glock 20. I Put together quite a few rounds with various bullet weights ranging from 90 grain 9mm bullets up to 158 grain JHP's for the .357 Mag.

Unfortunately, my chronograph suffered a fatal malfunction. (Okay...I shot the damn thing!! There, I admitted it. Happy now??)

Obviously, I wasn't going to do any velocity testing so I had to settle for function tests. I'm happy to report that all rounds in all bullet weights functioned perfectly. No stoppages of any kind.

Not counting the dead Chrony, I was quite pleased with the results, so far.

Lighting these things off really drew a lot of attention. Awesome muzzle blast!!! It would rattle the roof of the shooting shed.

Fast forward three weeks......

Here's my third outing with the 9x25 Dillon. It was a nice Friday and I didn't feel like staying home and watching the Olympics. The weather was clear and sunny , around 15 C (60 F). (Whose idea was it to have the Winter Olympics here anyway?).

So with spare Chrony in hand, off I went.

These velocities are in order of bullet weight.

(???) means "WTF???"

Sierra 90 gr. JHP (.355 dia.)
Winchester WLP primers
5 shot strings

12.5 gr. Blue Dot
Velocity (fps):
1) 1847
2) 1685 (???)
3) 1785
4) 1820
5) 1822
Extreme Spread : 162

13.0 gr. Blue Dot
Velocity (fps):
1) 1886
2) 1876
3) 1826
4) 1861
5) 1841
Extreme Spread : 60

13.5 gr. Blue Dot
Velocity (fps):
1) 1832
2) 1871
3) 1844
4) 1836
5) 1910
Extreme Spread : 78

14.0 gr. Blue Dot
Velocity (fps) :
1) 1939
2) 1886
3) 1895
4) 1973
5) 1904
Extreme Spread : 87

14.5 gr. Blue Dot
Velocity (fps)
1) 1943
2) 1894
3) 1929
4) error
5) 1927
Extreme Spread : 49

Lots of flash and "BOOM" with these. Really moving!!!
_____________________________________________________________________________________

Speer 110 gr. Gold Dot HP (.357 dia.)
Winchester WLP primers
5 shot strings

14.5 gr. H-110
Velocity (fps)
1) 1348
2) 1342
3) 1266
4) 1341
5) 1308
Extreme Spread : 82

15.0 gr. H-110
Velocity (fps)
1) 1478
2) 1407
3) 1395
4) 1389
5) 1383
Extreme Spread : 95

15.5 gr. H-110
Velocity (fps)
1) 1418
2) 1470
3) 1487
4) 1386
5) 1434
Extreme Spread : 101

16.0 gr. H-110
Velocity (fps)
1) 1459
2) 1463
3) 1480
4) 1412
5) 1433
Extreme Spread : 68

16.5 gr. H-110
Velocity (fps)
1) 1506
2) 1450
3) 1484
4) 1439
5) 1464
Extreme Spread : 67

The last two strings look more consistent. Higher charge weight??
_____________________________________________________________________________________


Speer 110 gr. Gold Dot HP (.357 dia.)
CCI #300 primers
5 shot strings

11.5 gr. Blue Dot
Velocity (fps)
1) 1565
2) 1521
3) 1555
4) 1600
5) 1524
Extreme Spread : 79

12.0 gr. Blue Dot
Velocity (fps)
1) 1607
2) 1576
3) 1552
4) 1550
5) 1650
Extreme Spread : 100

12.5 gr. Blue Dot
Velocity (fps)
1) 1601
2) error
3) 1648
4) 1635
5) 1638
Extreme Spread : 47

13.0 gr. Blue Dot
Velocity (fps)
1) 1593 (???)
2) 1579 (???)
3) 1717
4) 1679
5) 1705
Extreme Spread : 126

The 12.5 gr. charge looks the best in this batch. I don't know what the deal is with the 13.0 gr. charge.
_____________________________________________________________________________________

Sierra 115 gr. JHP (.355 dia.)
Winchester WLP primers
5 shot strings

11.5 gr. Blue Dot
Velocity (fps)
1) 1611
2) 1562
3) 1607
4) 1561
5) 1593
Extreme Spread : 50

12.0 gr. Blue Dot
Velocity (fps)
1) 1648
2) 1651
3) 1604
4) 1641
5) 1609
Extreme Spread : 47

13.0 gr. Blue Dot
Velocity (fps)
1) 1735
2) 1700
3) 1689
4) 1696
5) 1672
Extreme Spread : 63
_____________________________________________________________________________________

I couldn't test any of the 158 grain .357 JHP's because I blew them all off last time. I'll make up some more for the next time around. Stay tuned.

Again, I had no stoppages during this batch of testing. I can't fault the rounds reliability....at least from my perspective. Both powders used burned very cleanly. The empty brass was bordering on spotless.

One thing I did notice, though.....My Glock did not seem to fling the empty brass that far away. When I shoot 10mm out of this thing, it really goes for distance. I'm guessing that the longer barrel and smaller bore add more weight on the top end and keep the slide velocity down.

Feel free to comment (and check my math). I still learning.

Thanks.

Mike.

P.S....The spare Chrony survived!!!!!!
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