I have a bit of personal experience to relate. When a lot younger, and with a heap less common sense, I acquired a bunch of FMJ Military Ammo for my SMLE. Wanting to see if this ammo would expand if modified, I filed the tips off several rounds, leaving only a small amount of lead exposed in the center [maybe 1/16"-3/32"]of the tip. I then shot these rounds into various media, trying to recover them after to see what had happened. They say the angels protect the fools and half-wits [not sure which category fit me best at the time!]. I shot one of these modified rounds into a big Fir wood block, and then attempted to chamber another round. Couldn't quite close the bolt, even when I tried pretty hard. Opened the action and pulled the bolt out. Took a look down the bore. I could only see a small circle of light. I had figured out by now that something was seriously amiss, so found a ¼" brass rod and dropped it down the barrel and gave it a "rap" with a hammer. Out of the throat popped the complete jacket of the previously fired round, minus all the lead core. The lead had all squirted out through that small orifice at the tip of that bullet. In examining the Fir block, There was no bullet-sized hole in it, only a bunch of smaller perforations in the bark, none of which penetrated more than 1" or so. I shudder to think of the possible consequences if that jacket had lodged just ½" further up the bore than it did!! Nope, don't do it. It just is not worth it. Regards, Eagleye.