Hi.
Finally got that silencer. Pic of rifle will be coming, yes.
I have need for subsonic load to save ears of my dog. Only decent powder available here for that purpose is probably Vihtavuori N32C which is originally meant for CAS loads like TrailBoss is.
I have loaded normal loads for 9mm, 38, 357mag, 45-70, 222rem, 30-06, 338WM, etc during last 30 years and did read most of data available in web, but can't find actual data for this rifle with N32C.
Does anybody have access to Quick Load and could check if same rules go with this, as with TrailBoss? (I mean that volume thing, measure where bullet ass lies and that's 100%, then start with 80% of that)
Or if I make this clear: can I go BOOM with this powder? Is it possible to overload?
I've been thinking to load it with 300gr XTP to get decent terminal ballistics with near sound velocities. Is that ok, or should I go with something lighter?
Test results:
------------------------------------
Temp outside -4C
Bullet: XTP 300
Powder: Vihtavuori N32C
COL: 2.138 (54,3mm)
charge | Speeds (4 shots) | Average
14.5gr | 1109, 1105, 1103, 1064 | 1095
14.0gr | 1070, 1054, 1098, 1065 | 1072 Smallest group so far.
13.5gr | 1020, 1053, 1082, 1074 | 1057
I think optimum sub-sonic might be around 13gr, so I will test that also. Bad news is that group size seems to be growing when I go under 14gr. In my opiminion charge weight change affects suprisingly little to speed.
------------------------------------
Added 22 feb 2019 - Longer COL:
Temp outside +4C
COL: 2.154 (54,7mm)
charge | Speeds (4 shots) | Average
13.5gr | 1016, 1001, 1001, 1006 | 1006 Group about inch. 3 of them little over half inch. (About 15mm)
13.0gr | 984, 1002, 1008, 983 | 994
I probably load rest of that bullet box with 13.5gr mentioned above. Sound is about same level with un-silenced 22LR.
------------------------------------
Added 26 feb 2019 - Test with shorter COL:
Temp outside +3C
COL: 2.000 (50,8mm)
charge | Speeds (3 shots) | Average
13.0gr | 1023, 994, 991 | 1003
12.0gr | 894, 919, 913 | 908
Totally doomed idea, jump to lands just destroys accuracy. "Groups" were over 2" @50 meters.
------------------------------------