Not to be nasty, but I think the Darwin award just almost applies already once you jam the bullet (but just almost)
in a CF rifle.
I thought of Griff's idea too last night and also simply tapping with a close fitting rod. I'm not sure how "jammed" this is (haven't seen it).
Knowing the guy, he may go for the black powder idea (thanks for the details). I'll insist that he prefaces the whole exercise by loudly shouting "hey ya'll watch this!!"
I suspect a risk is thinking it's taking too long and then walking up to see why!
There's a saying that your good friends are there to help you out after you've got yourself in trouble, but your best friends are there right beside you saying, wasn't that really AWESOME.....
For this experience I'll stick to being a good friend....
Thanks for all the replies so far!