Ever notice how tough it is to find .30-30 FMJ ammo??
Wyosmith got it right with the part that about everyone leaves out, its not JUST the recoil, its also the rounds in the magazine under spring pressure (remember how you had to push to load them through the gate?)
slamming back when the round being fed is lifted to go into the chamber.
We say its recoil that can detonate rounds in the tube, and recoil can be the cause when it happens but it doesn't happen the way recoil mashes the nose of bullets in a box magazine. It's more like the way recoil "pulls" the bullet from a revolver case.
The rifle recoils back, the rounds in the tube want to stay where they are (inertia), so the seem to "float" in the tube, until the spring shoves the entire ammo column back to the stops, so what you get is the entire weight of the ammo column driven by the magazine spring, against a hard stop, which can apply considerable force to the primer.
The heavier the recoil, the further the rifle recoils away from the rounds in the tube, and so on.
We get around this problem by using ammo with bullet tips with flat or rounded profiles, softer than the primer cup metal, and sometimes larger than the primer in diameter. As long as the force on the primer isn't a (fairly) sharp, hard point, primer detonation is unlikely.
Remington came up with a unique solution to the issue in their pre-WWII pump rifles, the models 14 and 141, using "dimples" in the tube magazeing body that created a "spiral" in the ammo column, so that the tip of each bullet did not rest on the primer of the round ahead of it. This allowed the safe use of pointed bullets in those rifles.
I remember hearing a story from the 70s (or maybe earlier, and just passed on) about a fellow who lost a couple fingers from a chainfire magazine detonation, due to his use of too pointed, too hard bullets in a .348 Winchester. No idea if it was real, or a made up "warning", but possibly real, as the .348 has a whole different level of recoil than a .30-30 class round, and compared to the recoil of a .327 or .45 Colt, its in a whole different galaxy.
Load the usual "standard" bullets (and loads) for the caliber and odds are extremely low you'll be at risk of a magazine detonation.