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I've been searching but I havent found anything definitive. Is a SL6 .223 only or can it shoot 5.56 as well?
 

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I believe it is a .223.... it should be marked on the barrel/receiver.

if marked 223, then 223 only. 5.56 is a higher pressure cartridge.
 

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STAGE 2, I guess your SL6 is made and proofed in Germany so there is no problem to shoot both cartridges.
Unlike SAAMI, the C.I.P. requirements for the .223 Remington in measurements of the case etc. and the maximum pressure are the same as the NATO STANAG 4172 for the 5.56x45mm.
 
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