You will note 30-30 bullets are advertised for 30-30 where the rest of the bullets in 30 cal are for conventional chambers like 30.06 and 308.
The Speer No. 10 reloading manual that first lists the 110 gr. Varminter bullet includes it as an application for .30-30. With no notes about any peculiarities that might've been helpful - or known to Speer at the time. However, the Speer No. 14 book has "lab notes" at the bottom of page 431 that address the specific problem that started this entire thread.
Same thing on 35 Remington. I found it when I wanted to load 180 gr. 357 Mag bullets in the 35 Remington.
In my Remington 760, I have this issue with Hornady .358 bullets with the tangent ogive. No issue with heavy .357 Mag/Max bullets like Hornady 180 gr. XTP. Maybe in part because the .357 bullets are .001 smaller in diameter. My example of the Rem. 760 has a fairly short throat and I'd thought of having the leade throated. But I don't want to entrust it to a gunsmith so i just load what it likes. Unfortunately, the Remington 200 gr. .358 spire point bullet is no longer made.