I not on all the time so I have a few things to threw out…
Are you crimping?
Where are you setting your bullet?
What type of crimp did you use if you are?

I set my bullet .15 off the lands and then used my crimp. HOWEVER, it isn’t a roll crimp. (I “think” mine is a profile crimp?) And I engage it just to make it snug, not to deform jacket. {I don’t have access to my loading books to look it up right know so if someone would be willing to jump in here on this one and help it would be MOST appreciated!} My dies are CH-4D if that helps any.
You don’t HAVE to use a crimp for the 375 Win, in fact a lot of books suggest shooting them both ways.
Ps, the nice thing about the 220 Hornady is its REALLY flat point. I can’t reach the lands with a 200gr Sierra or a 235 Speer, but the 220 Hornady does it with ease.