I have heard of people using a miter box and saw (hand version of course, not power) so that the cut is as straight as possible. I personally use a dremel spinning at high with a simple cutting tool attached. It is fast and as long as your hand is decently steady I think that it produces a better cut. Tight Lines.
Just my 2 cents for cutting blanks... Make sure you don't cut right thru the blank in one pass like a chainsaw thru a tree limb. Instead, you should lightly cut around the circumfrence of the blank to cut through the surface fibers of the blank. Afterwards, you can cut right thru and you won't have the problem of shattered fibers on the "new" butt end.
I think that is the beauty of using the Dremel with a cut off wheel, you can't spilt the blank because there is no need to apply a lot of pressure as there is in sawing. Anyone have a problem with spilting or otherwise aveing adverse affects using the cut off wheel or similar approach?