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Hi mawser, the 14x1 will work. Check the diameter of your barrel 120mm back from cutting point to see if the rear end will fit ( assuming the suppressor your getting is an overbarrel model).

mawzer308, a standard over barrel should fit easily after cutting the barrel 3 or 4". 15x1, 16x1 or 5/8-24 could be done , the latest being the most popular.

The twist is a bit slow, but Robert knows his projectiles quite well and will be able to advise you on what work best. And testing will also show you what works and what does not. Regarding powders,...