300BlkTalk

H110 pretty close (almost identical) to W296?

My 16" carbine gas will cycle no problems with silencer on.

Gas port .120"

17.9gr W296
CCI BR4 primer
125 Nosler BT (or 130gr Barnes TTSX)
2.060 OAL

This also cycles no problem without suppressor for me.

Altitude is not a statistically significant factor in determining speed of sound. Temperature is the only variable you need to deal with. This is a calculator for SOS: http://www.sengpielaudio.com/calculator-speedsound.htm Pressure and Density (in an ideal) are equal and opposite; in effect cancel ...

I just tested a few loads yesterday.... 5 round strings (12.5", through a suppressor)...these may be 240gr(?) but should be close 10.7gr IMR4198 2.20 OAL 1.730 on comparator min 1077 max 1149 avg 1106 SD 26 ES 72 10.3gr 2.20 OAL min 1034 max 1088 avg 1056 SD 23 ES 54 10.0gr 2.173 OAL 2.704 com...

If shooting through a traditional chrony while testing subsonics, I found it was helpful to shoot through a blast shield; essentially a barrier with a 2" vertical slot to shoot through, placed in front of the chrony. I was sometimes seeing random velocities, apparently caused by high speed powd...

I tried 2 subsonic loads today that were exactly the same except for the OAL 2.180 and 2.220. There was quite a difference in speed/consistency/accuracy. I was surprised to see such a change just by adjusting the OAL. Series #8 Shots:10 Bullet: Hornady Amax 208gr Min 1025 Max 1098 Powder: A1680 @ 1...

Quick 3 shot string over magnetospeed V2 yesterday...

12.5" AR through MAE suppressor.

130ttsx
2.170OAL
18.0gr W296
CCI BR4 primers

min 2117
max 2155
avg 2128
SD 9
ES 8

Yet to put on paper through the new barrel, but was great through 16" suppressed.

I just tested a few loads yesterday.... 5 round strings (12.5", through a suppressor)...these may be 240gr(?) but should be close 10.7gr IMR4198 2.20 OAL 1.730 on comparator min 1077 max 1149 avg 1106 SD 26 ES 72 10.3gr 2.20 OAL min 1034 max 1088 avg 1056 SD 23 ES 54 10.0gr 2.173 OAL 2.704 comp...

Another one for magnetospeed. I just imported a V2 from the U.S. Just changed from a 16 to 12.5" barrel. No sighting in done, within 5 minutes had 5 strings of 5 shots measured and archived for development. Didn't have to sight in first (to ensure I didn't shoot a traditional type chrony). Done...

My second 300BLK, and first foray into the world of the AR15.... http://i1330.photobucket.com/albums/w564/StonkerNZ/Stag300BLK_zps1eeae9cb.jpg http://i1330.photobucket.com/albums/w564/StonkerNZ/StagsuppressorandVXR_zps3b86ff9d.jpg Facelift; 12.5 Barrel and Spearmags stock to comply with recent law ...

Once I finish some garage projects I believe my next endeavor will be to get a processing area set up. Any tips for us newbies? ; Follow the pros (butchers)... A decent rail and hooks for hanging the carcass. Decent size stainless tops for easy cleaning; personally I would like one at least wide/lo...