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Old 12-30-2010, 18:17   #11
whenmonkeysfly
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Join Date: Jul 2006
Location: Florida
Posts: 360


Quote:
Originally Posted by robert91922 View Post
- Glock 20
- IGB custom barrel 4.6" w. full supported chamber
- primers: CCI 300 Large Pistol
- recoil spring: DPM MS 3-spring system for Glock 20/21 (yellow main spring)
- firing pin spring changed from standard to "Red - 28 Newton"
http://www.glock.com/english/options...gpinspring.htm
- powder: Vihtavuori N350
- bullets: Speer GDHP 155gr
- brass: Starline (new)
- OAL: 1.262
- temperature: 25 oF (-4 oC)
- 1 string: 3 shots only
- distance from 1st Chrony screen: 3m (approx. 10 feet)
- I cleaned barrel quickly with brass-brush and hard-plastic brush after fourth string (after 12 shots)

load (grains)~~~~~average (fps)

11.0.................1417
11.2.................1434
11.4.................1455
11.6.................1465
11.8.................1493 primers flattened
12.0.................1512 primers very flattened, 1 primer fell out

IMO 11.2 load would be max if I'm gonna make SD loads with these components for winter carry. For hot summer days should drop down to 10.4 (or lower) or use slower powder e.g. 3N38.

Thanks for the data Robert! I've got a boatload of Vihtavuori N350 and a few thousand Rainer 165 grain TC bullets that I could push to ~1200-1250fps. I use both blue and red flavors of Newton Springs in a number of my Glocks. Really good for those hard CCI-350's.
__________________
Navy Corpsman, 1971-1975; NRA Patron Life Member; The 10mm "...more energy at 100 yards than a .45 ACP at the muzzle." - Massad Ayoob quoting Col. Jeff Cooper

Last edited by whenmonkeysfly; 12-30-2010 at 18:19.. Reason: Addition
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