The only time I broke a de-capping pin was on 1 brass casing that was defective with an off-center primer flash hole. I contacted Hornady, the die mfgr I use, and they sent a replacement pin and related assembly out that day to me no charge.
The other possibility of some (e.g. military .30-06 ammo) has Berdan (2 offset) flash holes. I don't know this is the case with the caliber you refer to though.