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I'm an Ork and SM player. But the only armies I've played against are Tau and CSM. The Tau guy I've only played zone mortalis so I didn't get to know his full potential.

I want to know what powerful weapons are out there and what race owns them.

If you could follow this format it would be awesome. Hopefully it's not against some forum rules.

WPN NAME RANGE STR RACE UNIT TYPE
shook attk gun. 60". 2D6. Ork. Big Mek (HQ)

Autocannons, Str 7, AP4, 48". Lots of IG units can take autocannons, and a few Chaos Space Marine units can, too. As can the Aegis Defense Line.

Missile Launchers with Skyfire upgrade drop from Str 8 to str 7, but gain skyfire and have 48" range. Devastators can take them.

Well, assuming you own the rulebook, you could start by looking at the weapon profiles in the back of the book. That'll cover most of them.

Deffguns str 7 ap 4 48¨ D3 shots
GOoooooooo Lootas!

There are loads this thread is going to get a bit ludacris. Might be better to be a bit more specific about what you want, however here goes... (Going to break from your convention and this is from memory)

Marines
Lascannon 48" S9 Ap2
Missile launcher (Krakk) 48" s8 ap3 (includes cyclone which is heavy 2)
Multimelta 24" s8 ap1
Plasma cannon 36" s7 ap2 blast

Tau
High yield missile pods 36" s7 ap4 heavy 4 broadsides
Missile pods 36" s7 ap4 heavy 2
Rail gun 72" s10 ap1 hammerhead
Heavy rail rifle 60" s8 ap1 broadside
Ion accelerator 72" s7 ap2 heavy 3 or s8 ap2 large blast or s9 ap2 large blast ordanance riptide
Ion cannon 60" s7 ap3 heavy 3 or s8 ap3 large blast hammer head
Seeker missiles 72" s8 ap3 broadsides and all tanks.

Skyhammer missile launchers, on Stormtalon Gunships.

60" range, S7, AP4, Heavy 3, Strafing Run

Eldar
Flakk missiles S7 AP4 48" Skyfire
Serpent Shield D6+1 shots S7 AP- 60" Pinning Ignore Cover
Doomweaver S7 AP6 48" barrage, large blast, pinning, monofilament
VibroCannon S7 AP4 Pinning, Vibro
Focused Prism Cannon S7 AP2 60" Blast

Damn it you got it before me :(
Serpent shield was mine.....