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I ordered some Griffin 10 gr slugs for my Stormrider. I wanted to see how they would shoot at moderate velocities and how they would expand. They sent me a sample of their 11 grain slug, marked Griffin 11gr CUP LDC 
. I shot those and collected the following data.
Shot 7 pellets at the paper. 3 at 25 yards went into about .25" CtC and 3 (tossed out a flier) at 40 yards went into about 0.75" CtC. I was impressed with that as it is better than the rifle shoots pellets. Muzzle velocity averaged 815 FPS and very consistent. I shot two pellets into a couple of plastic bottles of water stacked one inside the other to check expansion. Those are shown on the right of the target. One slug was shot at 25 yards and the other at 40 yards. The Impact velocity at 25 yards was about 750 fps and impact velocity at 40 yards was about 650 fps. Measured BC for the slug was 0.022. One slug was shot into a board at about 2 meters.
I did not particularly like the expansion. The slugs did expand to the depth of the hollow point but then stopped. That is what one wants a bullet to do. They both expanded to 5mm. Higher muzzle velocities would probably increase that somewhat. Both slugs did stop after penetrating two layers of plastic and were caught in the inside bottle. Again there were two plastic bottles one inside the other both full of water. So penetration was fairly well controlled. I suspect these slugs would perform well on game. There is a ground hog in the yard. We may get to see if I am right about that.
I am very impressed with the accuracy of these slugs. The BC is good for a 0.177 and 11 grains for sure. I still have the slugs I ordered and will test those more extensively probably at higher velocities. I will do that in a different thread.
. I shot those and collected the following data.Shot 7 pellets at the paper. 3 at 25 yards went into about .25" CtC and 3 (tossed out a flier) at 40 yards went into about 0.75" CtC. I was impressed with that as it is better than the rifle shoots pellets. Muzzle velocity averaged 815 FPS and very consistent. I shot two pellets into a couple of plastic bottles of water stacked one inside the other to check expansion. Those are shown on the right of the target. One slug was shot at 25 yards and the other at 40 yards. The Impact velocity at 25 yards was about 750 fps and impact velocity at 40 yards was about 650 fps. Measured BC for the slug was 0.022. One slug was shot into a board at about 2 meters.
I did not particularly like the expansion. The slugs did expand to the depth of the hollow point but then stopped. That is what one wants a bullet to do. They both expanded to 5mm. Higher muzzle velocities would probably increase that somewhat. Both slugs did stop after penetrating two layers of plastic and were caught in the inside bottle. Again there were two plastic bottles one inside the other both full of water. So penetration was fairly well controlled. I suspect these slugs would perform well on game. There is a ground hog in the yard. We may get to see if I am right about that.
I am very impressed with the accuracy of these slugs. The BC is good for a 0.177 and 11 grains for sure. I still have the slugs I ordered and will test those more extensively probably at higher velocities. I will do that in a different thread.
