Shifting groups

[spadegrip]

I was benching my Enfield 3 band rifle musket today using Swiss 1 1/2 F powder. My first 3 shots were touching in the x ring. Great! I thought, then the next 5 went into a ragged hole at 9:00 about 2 inches from the first group. The last three shots were touching but about 4 inches lower than the second group. What is going on? Is the barrel heating? I had fired ~20 shots thee day before and I hadn't cleaned it except for using a wire brush. Could fouling do this? I could see if the musket wasn't grouping but the groups were great just shifting.
Thanks for your help.

[Lou Lou Lou]

Minie ball impact can change one inch for 0.008 movement of the sight. In other words, it might have been a changing sight picture. It doesn't take much to move a sight by 0.008. Gook luck

[spadegrip]

Minie ball impact can change one inch for 0.008 movement of the sight. In other words, it might have been a changing sight picture. It doesn't take much to move a sight by 0.008. Gook luck

I thought of thAt myself. These 59 Year old eyes my not be what they used to be.

[Lou Lou Lou]

Try it off hand. That is, after all what we do.

[Maillemaker]

Make sure your barrel bands and tang screw are tight, also.

Steve

[spadegrip]

Make sure your barrel bands and tang screw are tight, also.

Steve

I will check that next time I am experimenting. Thanks for the help.