Add this to your Table (In the load script):
// This will create a dual. This function will create buckets for us with an increment of 25 (just change 25 to whatever interval you'd like)
DUAL(FLOOR(BP, 25) & '<= BP <' & FLOOR(BP, 25)+25, FLOOR(BP, 25)/25) as ABC
Create a bar chart
It should sort automatically, But if not, then sort by ABC
Please note I haven't tested this. Let me know.