Step 1: Rods
Pros: durable, reliable, work well in mags, decent range.
Cons: the main problem with rods is that they tend to flip sideways mid-flight. this both reduces impact and increases drag, causing them to spin off target. this happens to small rods earlier, but it has a greater effect on long rods.
Recommended for: all conditions.
Step 2: Oodammo
Pros: accurate, good range, easy to make, works in special mags.
Cons: the main problem with oodammo is the limited number of weapons it will work in. there is also a chance that it may break on contact with target.
Recommended for: All wars, indoor sniping.
Step 3: Arrows
Pros: super long range, high power.
Cons: long reload time, uses many peices.
Recommended for: outdoor wars, sniping.
Step 4: Connectors
Pros: i'm not sure there are any. but they're better than nothing.
Cons: bad range, bad reliability, bad accuracy.
Recommended for: a situation when you don't have many rods.
Step 5: Weighted rubber bands.
Pros:carry their own power source,
Cons; bad range
recommended for: making a band gun legal in a knex war.
Step 6: Artillery shells
Pros: long range (with a cannon, 120 feet.), HUGE power.
Cons: high peice cost.
recommended for: destroying enemy forts, smashing mailboxes.