I would want 26" bbls. My 450/400 has 26 inch bbls, my 450 No2 has 28 inch bbls.
I would prefer 27 or 28 inch bbls to 24 inch bbls.
The longer bbls feel better to me.
Funny thing is I like 18 to 20 inch bolt rifles real well. I even have a 375 H&H with 19 3/4 inch bbls.
Like 400 Nitro says handle different lengths and get the one that feels best to you.