Chuck,
Depends, lol.
Here ya go,,,,,,
http://www.beartoothbullets.com/tech_notes/archive_tech_notes.htm/28
At mach 1, circa 1100fps, my 444S will not stabilise a Lee C429-310-WFN, at 1300fps, round holes. And here's a thread over at www.marlinowners.com that's very thorough.
http://www.marlinowners.com/board/viewtopic.php?t=4333
Lotsa' variables!
Read on.
{;o)
Cheers.
R*2