I went out for a bit of evening rabbiting tonight and after waiting for two roe kids to bugged off I finally got on my sticks for the first shot........click!
On opening the bolt the case literally popped out under gas pressure, WTF I thought as the "shot" felt very odd. I then removed the bolt to have a quick look down the tube. This proved enlightening as there was no light visible! WTF I thought again.
The rifle was returned to the slip and the shooter returned to base for further examination of said Finnfire.
The 40gn Eley hollow point has travelled about 12 of the 14 inches of barrel and just stopped. The bullets hollow base had what appeared to be a lump of powder residue stuck to it. I can only assume that I had the same issue that seems to afflict some HMR rounds where moisture get into the case and causes the powder charge to form one lump which then doesn't burn correctly.
I pulled the heads off a few more from the box but all appeared normal.
So the motto is "If it doesn't feel right, check it out first!"