rensning af Fænghette lomme.

[M@X 2.1]

Jeg har nu fundet en nørd der overgår selv dravis (undskyld dravis)

Han har udført et forsøg hvor han hælder krudt i vand og lader det stå og trække. Så hælder han det ud på noget papirservietter og tørrer krudtet udvendigt, hvorefter han lader det halvvåde krudt (vejet til et vandindhold på 1,45%
Derefter skyder han dem af sammen med samme antal referance patroner ladet med tørt krudt.
Resultatet er at de skyder skræmmende ens. Krudt der har ligget i vand og derefter blot tørret imellem nogen papirsservietter indeholder langt mere vand end den smule vand som Gammeltoft mener kan være opsuget af en smule krudtslam.
Alligevel falder udgangshastigheden kun 7,28%. Altså med smaskvådt krudt.

Så tesen om at krudtslam kan holde vand nok til at kontaminere krudtet må siges at være skudt ned.

Hele testen kan læses her incl. mailkorrenspondance med Norma.

http://benchrest.com/showthread.php?7518...der-charge

En den ged ved at være barberet, eller hvad??? Krudtslam kan ikke holde vand nok til at ødelægge en ladning.

The ten dry rounds were fired first with the following results:

Average muzzle velocity of 2981 f/s with an e.s. of 32 f/s
Average peak pressure exceeded the wet charge average peak pressure by 18.6%
Average BCg1 of 0.444 with an e.s. of 0.017 or 3.8%
The 10-shot group impacted at 101.6 yards into a 0.88" group with 9-rounds into 0.80"

The ten wet rounds initially had charges of 54.00 grains H1000, were soaked under water for an average of 22 hours. The wet charges were poured separately onto a paper towel to remove excess water then placed on a second paper towel to remove additional surface water. At that point the powder had absorbed water and likely had water on the powder granule surfaces in the maximum amount of 1.13 grains or 2.09%. To provide wet charges with consistent amounts of water, the wet charges were air dried for approximately ten minutes each to reduce the water gain to an average of just under 0.74 grains for a 1.36% average gain in water.

The ten wet rounds were fired last with the following results:

Average muzzle velocity of 2764 f/s with an e.s. of 27 f/s
Average peak pressure was 15.7% below the average peak pressure of the dry charge
Average BCg1 of 0.443 with an e.s. of 0.010 or 2.3%
The 10-shot group impacted at 101.6 yards into a 1.00" group with 9-rounds into 0.67"

Thus, comparing the water soaked wet charges to the dry charges, by adding 1.36% by weight water to each 54.00 grain H1000 charges the wet charges:

Average muzzle velocity was reduced approximately 217 f/s or 7.28%
Average peak chamber pressure was reduced approximately 15.7%.
The 10-shot groups and BCg1 for the two loads were basically equivalent.

--
mvh M@X 2.0
Boltlift - or bust...

Time weighed heavily on the craftsmans shoulders whispering
Compromise!

No true craftsman ever listened!