I just was gifted a doz. .44 400 softballs. I want to break-in a new Miken, 1-piece red maxload. I know the recommendation is to use .44 375 balls for break-in. Are the 400's Ok to use for this purpose?

I've been swinging the red Maxload almost exclusively for 5 years and would not suggest using anything more than 44/375 balls for break in. The OG models took about 15-20 hits to break in. The newer models of the last couple years take about 75 hits. The bat is generally not a very durable model, so be wary of this. My OG 28 ounce lasted 300+ swings but I've been told this is a complete freak of luck. Since it broke about 2 years ago, I've gone through 4 other maxloads that lasted between 75-150 game/bp swings. My favorite senior stick of all time. Enjoy, sir!

We used 44/400 balls at the Roanoke ISSA tournament 2 weeks ago.
My Red Max cracked on the 1st swing . . .