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- Dec 29, 2007
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The past two days of shooting consisted of shooting the Omega Dream Season, 80g Blackhorn, 289g hard cast boolit, crush rib sabot, and W209 primer. The first shot each morning was made from a cold clean rifle, and breech plug. Two different vent liners were used; one each morning. Both vent liner have a flash hole 0.032" in diameter.
Yesterday the breech plug had the domed vent liner installed; a total of 10 shots were made.
Upon returning home the fouled breech plug, with the domed vent liner was weighed. The plug weighed 582.6 grain. Then the carbon in the flame channel was scraped/removed using a 5/32" drill. The plug then weighed 581.8 grain.
The flier on the target was not the first shot; it was the second shot.
It has warmed up here now, so a warming barrel was kind of an issue. The next two photo show the rifle being cooled this morning.
This morning the shooting was done with a flat vent liner in place. All things were the same as yesterday, except the vent liner was changed. As yesterday, ten shots were made, but the aim was changed from the middle to the bottom target.
At home the fouled breech plug with the flat vent liner was weighed. Weight was 572.1 grain. The Flame channel was cleaned with a 5/32" drill, and the breech plug weighed once again. Without the carbon/soot in the flame channel, the plug weighed 570.8 grain.
It appears the domed vent liner allowed 0.8 grain of soot/carbon into the flame channel, whereas the flat vent liner allowed 1.3 grain.
Yesterday the breech plug had the domed vent liner installed; a total of 10 shots were made.
Upon returning home the fouled breech plug, with the domed vent liner was weighed. The plug weighed 582.6 grain. Then the carbon in the flame channel was scraped/removed using a 5/32" drill. The plug then weighed 581.8 grain.
The flier on the target was not the first shot; it was the second shot.
It has warmed up here now, so a warming barrel was kind of an issue. The next two photo show the rifle being cooled this morning.
This morning the shooting was done with a flat vent liner in place. All things were the same as yesterday, except the vent liner was changed. As yesterday, ten shots were made, but the aim was changed from the middle to the bottom target.
At home the fouled breech plug with the flat vent liner was weighed. Weight was 572.1 grain. The Flame channel was cleaned with a 5/32" drill, and the breech plug weighed once again. Without the carbon/soot in the flame channel, the plug weighed 570.8 grain.
It appears the domed vent liner allowed 0.8 grain of soot/carbon into the flame channel, whereas the flat vent liner allowed 1.3 grain.