This morning i went up and did some shooting at paper, and clocked some loads too. It was about 55 degrees, and some breeze. Elevation is around 4700'. I first shot from 203 yard; then from 99 yard. Used one powder (BH209) in 2 different vials; one 110g; the other 120g. Tried 3 different bullet; 200g SST, 270g Deep Curl, and 300g Deep Curl. Used Harvester sabot for the Deep Curl, and MMP sabot for the SST. Used STS primer for all the shooting, and took 2 rifle, the Triumph, and the Accura. The Triumph has a 4X scope with a tapered crosshair, and was used to shoot the SST. The Accura has a 3x-9x scope with a fancy reticle, and was used at 8 power to shoot the Deep Curl, using the second dot at 203 yard. Both rifle had been shot about 20 times before this morning, and never cleaned. All group are 3 shot, except the one 5 shot group.



The group circled by blue are 200g SST pushed by 120g BH209. The lower 5 shot group was made from 203 yard. The 3 shot group was shot through the clock at 99 yard.

Speeds were measured at 10 yard.

2060 fps
2093
2096

Averages to 2083, which is near 2115 at the muzzle

The group circled by green are 270g Deep Curl pushed by 110g BH, and was made from 203 yard.

The top yellow group was made by 300g Deep Curl pushed by 120g BH, and was shot from 203 yard. The bottom yellow group was the 300g Deep Curl pushed by 120g BH; shot through the clock, and was made from 99 yard.

Speeds measured at 10 yard were

1940 fps
1955
1949

Which averages out to 1948 fps, which is about 1980 fps at the muzzle.



I like the way i can hold center of chest from 0-200 yard using the 200g SST in the Triumph with a 4x scope, and make a lung hit.






At home the breech plugs were removed. Note the absence of blow back around the primer in both plug.











Both flash hole allowed a 0.029" pin gage through. The speed breech is modified to accept a vent liner, and has a deeper than factory recess on the face. The speed breech was also modified to head space tightly using the STS primer. Both flame channel are 5/32" diameter when clean. The short breech plug channel is very plugged with carbon. One cannot push a 1/16" drill through the flame channel in the short plug. The longer plug flame channel is still 7/64" clear. Both breech plug have seen about 30 shots. It seems the longer flame channel is better than the shorter flame channel, when it comes to longevity without cleaning. It has been written that the longer flame channel isn't so good when it comes to igniting BH, but this modified speed breech has been as reliable as the short plug here, and as the short Omega plug not used today, or shown.

Hunting accuracy is quite acceptable with either of these breech plug, after each has seen 20 or more shot. There doesn't seem to be a need to clean the flame channel to get decent groups. It seems the flash hole never gets plugged when one is shooting, and thus doesn't require any attention. There is no doubt in my mind that the factory made speed breech plug would have been just as good, and reliable, as this modified speed breech was, this morning. However, in order to shoot as clean as this plug did today, the factory plug would have required the use of the longer W209 primer. The factory Accura plug may or may not have worked this morning.