You did read that correctly.
I shot a fox last night with a 55grain BT from my 243.
Ordinarily expansion is... assured but last night's fox had a calibre sized hole going in and out.
The shot was from a high angle above on a heavily quartering towards fox. The shot entered high and in front of the shoulder and exited low and behind the shoulder.
One seems to hear a lot about BTs being a little too frangible but has anyone experienced them not opening up at all?