Subsonics - All Calibers
- Thread starter Two Shoes
- Start date
I’m using a 16” barrel with Banish 30 in .308. Got some good results with H4895 but going to try others.
"Modified" my AR mag by increasing the COAL to 2.310" in order to increase the space for the Hornady 225eldm.
Before that, the maximum with the given bullets that fit there was 2.270 and CBTO 1.590. And the groups were on average like this (subsonic)
100m
AV326 ms / 1069fps
ES 24ms / 78fps.
That did not prevent me from hitting the 12" gong at 300 meters with such a subsonic charge 6-7 times out of 10 quite predictably and even forming something similar to a group there (I posted a photo in the topic).
There were also sub moa groups with this charge at subsonic but I could not call them consistent.
Each such miss is a consequence of speed extremes according to the chronograph
So what did the magazine modification give me for this bullet?
Reduction of average groups at 100m by approximately 1MOA as well as reduction of ES and SD by almost half
Yesterday was seating depth test
Now the subsonic groups at 100m have become more similar to 208ELDM and 210VLD Berger.
208ELDM at 304m
is quite typical. Before the mag mod.
Width app. 12.5 inches.
back to the sitting depth test above
From left to right
below
A1680 1,530 4pcs one of which is a cold shot (I plan to use it too, because the CFE has run out in our stores)
Then everywhere 7 shots. CFE 11.2 grains
CBTO 1.530
AV 312/1023fps
ES- 17/55FPS
SD-5.2/17.3fps
CBTO 1.527
AV310/1017fps
ES-15/49fps
SD-5/16fps
CBTO 1.524
AV-312/1023fps
ES-6/19fps
SD-1.9/6.2fps
The graph shows an almost straight line, and also 3 bullets in one hole.
This will probably be my pick, which I'll fine-tune in the future.
Especially since, as can be seen from the previous (1.527") group, there is still a margin for erosion of the rifling.
CBTO 1.521
av312/1023fps
es-11/36fps
sd-4/13fps
Don't pay attention to the POI shift, after 3 groups I zeroed the rifle
Shooting in the field
wind 2.5-4 ms/5-9mpn 10.30
temp 18c/64frg
D.Altitude 489m/1604ft
RH 54%
Before that, the maximum with the given bullets that fit there was 2.270 and CBTO 1.590. And the groups were on average like this (subsonic)
100m
AV326 ms / 1069fps
ES 24ms / 78fps.
That did not prevent me from hitting the 12" gong at 300 meters with such a subsonic charge 6-7 times out of 10 quite predictably and even forming something similar to a group there (I posted a photo in the topic).
There were also sub moa groups with this charge at subsonic but I could not call them consistent.
Each such miss is a consequence of speed extremes according to the chronograph
So what did the magazine modification give me for this bullet?
Reduction of average groups at 100m by approximately 1MOA as well as reduction of ES and SD by almost half
Yesterday was seating depth test
Now the subsonic groups at 100m have become more similar to 208ELDM and 210VLD Berger.
208ELDM at 304m
is quite typical. Before the mag mod.
Width app. 12.5 inches.
back to the sitting depth test above
From left to right
below
A1680 1,530 4pcs one of which is a cold shot (I plan to use it too, because the CFE has run out in our stores)
Then everywhere 7 shots. CFE 11.2 grains
CBTO 1.530
AV 312/1023fps
ES- 17/55FPS
SD-5.2/17.3fps
CBTO 1.527
AV310/1017fps
ES-15/49fps
SD-5/16fps
CBTO 1.524
AV-312/1023fps
ES-6/19fps
SD-1.9/6.2fps
The graph shows an almost straight line, and also 3 bullets in one hole.
This will probably be my pick, which I'll fine-tune in the future.
Especially since, as can be seen from the previous (1.527") group, there is still a margin for erosion of the rifling.
CBTO 1.521
av312/1023fps
es-11/36fps
sd-4/13fps
Don't pay attention to the POI shift, after 3 groups I zeroed the rifle
Shooting in the field
wind 2.5-4 ms/5-9mpn 10.30
temp 18c/64frg
D.Altitude 489m/1604ft
RH 54%
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