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Fritzcat · #11 12-01-2009, 10:00 PM

I have just started loading for the whisper a week ago. I developed loads for the 762x39 and Win 296 was the best powder for sub-sonic, Horn 220gr RN and 9.5gr Win 296 gave me around 1050fps and was shooting 2" and less at 100yds with a .308 bullet out of a .310 barrel 16".

Fritzcat · #12 12-01-2009, 11:38 PM

Going by the Sierra Loading Book you are loading in the 1150fps range and this may be your problem. It shows 10.7 for 1100fps and 11.7 for 1200fps. It shows 9.8 will give you 1000fps with a 10" contender barrel, try it.

fasttwist · #13 12-01-2009, 11:58 PM

fritzact what kind of rifle and did it cycle.[7.62x39] how about an expanding 225 grain .310 bullet.

Fritzcat · #14 12-02-2009, 11:29 PM

I call it my AR47, AR 16" with 1x10 twist and carbine gas length. It cycles, but the second box of Horn 220 RN started hanging the nose sometime so I started loading some 200gr speer SP. I opened the gas hole .015 more to cycle these. So I started putting a 220 RN in chamber and 200SP in mag to hunt with. They have the same POI.