In the situation that OP raises, I ask myself: “Does Newton or Gandalf win this argument?”
Exactly. Does the bullet remain moving at the speed it already was? Or does the conservation of momentum require that it slows as it grows larger (and heavier)? If so, it would basically be useless as a weapon, because a handheld firearm couldn’t exert enough force to actually fire a cannonball any effective distance; At most, it can only exert as much force as the recoil exerts on the character. And a 12 lb cannonball would get rolled across the floor by the recoil, but not fired across the room.
I’d probably rule it’s somewhere in between, because “rule of cool” is just plain fun and that’s why we’re all playing the game. Having it be a full blown “it fires cannonballs at full speed across the room” weapon is obviously super broken. But maybe I rule that the bullets aren’t near the ring long enough to fully regrow, but it gets a +2 modifier to damage because you’re effectively firing rifle sized rounds with a handgun.
Or maybe I rule that they slow down as they grow, but the spell takes some time to wear off, which limits the maximum range and effectively makes it a devastating close-up weapon, but relatively useless at longer distances.
The point is that the players worked for it, and get some sort of payoff. Even if it’s not a complete game-breaking reward.
Exactly. Does the bullet remain moving at the speed it already was? Or does the conservation of momentum require that it slows as it grows larger (and heavier)? If so, it would basically be useless as a weapon, because a handheld firearm couldn’t exert enough force to actually fire a cannonball any effective distance; At most, it can only exert as much force as the recoil exerts on the character. And a 12 lb cannonball would get rolled across the floor by the recoil, but not fired across the room.
I’d probably rule it’s somewhere in between, because “rule of cool” is just plain fun and that’s why we’re all playing the game. Having it be a full blown “it fires cannonballs at full speed across the room” weapon is obviously super broken. But maybe I rule that the bullets aren’t near the ring long enough to fully regrow, but it gets a +2 modifier to damage because you’re effectively firing rifle sized rounds with a handgun.
Or maybe I rule that they slow down as they grow, but the spell takes some time to wear off, which limits the maximum range and effectively makes it a devastating close-up weapon, but relatively useless at longer distances.
The point is that the players worked for it, and get some sort of payoff. Even if it’s not a complete game-breaking reward.