john_vinblad wrote:Yes i will i am just waiting for daylight so chrony will work does not get daylight untill 09:45 here in Finland lol
Here are some of my subsonic results:
Equipment Used:
Rifle: Remington 700
Barrel: 16.5", 1-10" twist rate with AAC Breakout
(suppressor not attached)
Chronograph: Oehler 35
Ammo info:
Brass: Hornady Match trimmed to 2.005"
(brass unaltered other than full-length sized and trimmed)
Primer: CCI Large Rifle
Bullet: 168 gr Hornady BTHP
Powder: Vihtavuori N32C (Tin Star)
COL: 2.800"
Results:
Charge range: 12.5 gr - 10.0 gr Viht N32C (Tin Star)
(fps data are 3-shot averages from chronograph)
12.5 gr - 1302 fps
12.0 gr - 1268 fps ... 34 fps slower
11.5 gr - 1217 fps ... 51 fps slower
11.0 gr - 1127 fps ... 90 fps slower
10.5 gr - 1117 fps ... 10 fps slower
10.0 gr - 1064 fps ... 53 fps slower
220 gr Hornady BTHP (same powder)
11.5 gr - 1002 fps
(Stopped here. Those are already going too slow for me,
and all the other loads I had with me were even slower.)
My subsequent loads for a 220 gr bullet have been:
12.3 gr. I haven't shot them over a chronograph
yet but I suspect they will be right where I want them.
It surprised me that there was such a big decrease between 11.5 gr and 11.0 gr (90 fps) but only a 10 fps drop between 11.0 and 10.5 gr.
My goal is to keep them flying around 1050-1080 fps - 10.0 gr did exactly that (with the 168's).
Disclaimer: this is my data as shot through my rifle with the weather conditions as they were at the time I shot them (cloudy, mid-80's, and humid with a light breeze). Your results may vary. Also, if you have a slow twise barrel you may want to make sure they stabilize before shooting through your suppressor.
