[Smokin' Joe]

Nah, that'd have missed by a mile...

Ten feet should do it, .12 seconds of travel for the round at 2500 ft./second to go 300 ft., .12 seconds of travel for the target at 88 ft./sec, puts the target 10.56 ft. further downrange, not allowing that the shot is along the hypotenuse of the triangle.

[Condor51]

*** Ten feet should do it, .12 seconds of travel for the round at 2500 ft./second to go 300 ft., .12 seconds of travel for the target at 88 ft./sec, puts the target 10.56 ft. further downrange, not allowing that the shot is along the hypotenuse of the triangle. ***

You also get a 1st place Trophy for your excellent math skills.
The other Winner has a .50 Cal so I couldn't ignore that ;-)

BUT, no more winners. Contest over.
This isn't a gubmint run school contest where everyone gets a trophy just for 'being' :-)