Rifle cartridges do NOT need a "bell" at the case mouth like pistol. Your resizing die probably has the expander ball in it as part of the primer decap assembley.
My expander ball had worn down to where it's just right. It barely expands the case mouth, and just trues it up nice. An aggressive expander ball will stretch your case lengths out, and then you'll need to trim them back down. You can feel this happening on the upstroke of your press... kinda like the case is sticky in the die.
If you're loading boat tailed bullets, you shouldn't have any problems. You'll know you're having problems if you start to get fine copper shavings all over your turret. This happens when you're seating bullets on poorly trimmed brass or possibly too narrow case mouths.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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