When using a Lee 1000 in my misused college days, I took to putting my finger on top of the .357 case mouths during the indexing/advancing operation. With 296, even that tall case could not contain the mini-geyser of powder that would pop up.
Using a 9mm RCBS Green Machine, I did the same thing.
Not a tough thing to do, really. Encourages that extra measure of peeking at the cases to make sure they really got charged...
The RCBS worked better, but seemed more cantankarous than the old Star machines. Only two problems with Stars: NO WAY to not dump powder on every stroke; and muy expensivo (including oddball dies).
But when the Star hums, it's better than even a Dillon 550B.