ORIGINAL: bigcountry
Well, I guess the guys at Chrony is correct. I moved the Chrony back to 15 feet past the muzzle. I shot my 7mmSTW loads and gained another 100fps velocity. I tried out some RL25 loads and got good velocity but accuracy was 1.1MOA average with 5-10MPH winds.
7mmSTW
160gr Accubond
74gr 7828
2990fps Average
160gr Accubond
80gr RL25
3120fps Average
I sure wished I could help you as I am at mid stream myself on the darn thing. My rifle is a Sako 75 with a 25 inch, I think, barrel. I finally got it over 3300 with that 140gr but they were all over the place. I have a hunch...just a hunch mind you that it may perform better with the 150/160gr bullets. I did manage a 1/2 inch group with IMR4831at 3075 MV and gave up prior to deer season. I will not waste anymore powder in a rifle that underperforms a 7mag and I will not blow myself up stretching the evelope. My next testing will be with the 150 and 160gr bullet....all my buddies say it will shoot the 160's at 3300'/sec with no pressure problems...We'll see. regards, Rick.