You can keep them until you reach level 28
It is mostly used by high-level players due to RS Gold massive costs. Red chinchompas as well as Black Chinchompas are ammunition that can be ranged and which is used to smack monsters on a the 3x3 AOE field. When you hit a lot of monsters at simultaneously for high damage, players can get amazing performance rates. This method usually is used on Ape Atoll after finishing Monkey Madness 2 quest. It also requires high Ranged stats since it's not recommended if your hits are low.
From the beginning of level 1 all the up to level 28, you want to use Darts or Knives to train to increase your Ranged level. Those may look kind of expensive at first, but eventually it won't take a lot for advancing. They're extremely accurate and hits and can be acquired via Grand Exchange.
It is recommended to always use Knives that are higher than Darts because they're superior but if you can't afford the price, Darts are a viable alternative. Beginning it is best to begin with Iron weapons, and switch to Steel at the level 5. Once you've reached level 20, get Mithril Knives. You can keep them until you reach level 28.
Level 28 unlocks the ability to handle the Dorgeshuun Crossbow. It's an awesome weapon for the moment. It is a great hit precision, has a high accuracy, and costs nearly nothing. Bone bolts that can be fired by this weapon are extremely cheap (around 6 cents per bolt). However, that's not all - you can put Godbook or Shield on your second hand since it is a single-handed crossbow. All of this makes it a perfect weapon to train until level 50.
Although Dorgeshuun Cbow is amazing to use for leveling, but you might still need something different. If you are able to be a bit risky and want a different weapon, you can choose traditional crossbows. At level 31 Steel Cbow/Bolts with 36 Mithril Cbow/Bolts. After that, 46 Adamant Cbow/Bolts. While they are more lucrative than Dorgeshuun they cost more. The price of Buy OSRS Fire Cape Adamant Bolts on the Grand Exchange right now is currently 30 times greater than price of Bone Bolts which makes the use of those a big money waste.