Skip the rocks. Spherical steel or clay ammo (8mm is a great standard) provides the consistent aerodynamics needed for repeatable accuracy.
Accuracy is far more important than raw speed. A "fast" miss is still a miss. which slingshot should i buy
If you only buy one slingshot, make it this one. It is widely considered the gold standard for versatility. Skip the rocks
If you're practicing at home, grab a Catchbox (like the ones from YANDIA). It stops your ammo safely and lets you reuse it, saving you money in the long run. What slingshot is best for me? - SimpleShot Academy A "fast" miss is still a miss
Look for a frame with a wider gap between the forks; it's much more forgiving for beginners and helps prevent "fork hits" that can damage your frame.
It supports "pinch," "thumb brace," and "hammer" grips, meaning it adapts to how you naturally want to hold it.