1680 wasn't a bad powder in my 17. It was accurate, but the 2200 was just as accurate and faster. My records show that I was using 9.2gr (1680) for the 25gr Vmax.
20 HDY V-MAX 10.0 3,183 11.2 3,493 49,657 1.711
20 NOSLER VARMG 10.1 3,203 11.2 3,483 49,354 1.720
25 BRG VAR 9.0 2,862 9.8 3,041 49,156 1.720
25 HDY V-MAX 9.0 2,724 10.0 2,983 49,046 1.711
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25 gr Vmax
Hodgdon
H4198
.172"
1.715"
10.3
2,983
34,900 PSI
11.1C
3,187
42,500 PSI
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Hodgdon
Lil'Gun
.172"
1.715"
8.6
3,125
45,000 PSI
8.9
3,195
48,000 PSI