Thank you, all it was bringing up on my phone was gibberish.I would go with a 5 port for a 338. The TI pro 5 ST comes in .990 OD and the TI pro 4 ST comes in .860 and .990. The SS pro 5 ST comes in .990 and 1.20. The SS pro 4 ST comes in .860 and .990. Go with a TI or SS pro 4 if you want the smallest OD.