Other than it's a little dirtier than more recently developed powders, none at all.

It's been said to 'not meter well' but those complaints are largely from the folks who use small charges in pistol calibers (where it works very well by the way).

I've found it reliable in colder temps even with Fiocchi 616 primers.

Good choice.

"The price of good shotgunnery is constant practice" - Fred Kimble