I'm looking for a mould for my 16" AR15 carbine in 300 BLK that is going to wear a Sig SRD762TI suppressor shooting subsonic loads. Any opinions on the NOE 311-220-FN Blackout mould? Is the GC a good idea with the suppressor? I was also wondering if the HI-TEK coating will be effective on this grooved boolit or if I should consider a slick-sided boolit (Accurate Arms)? I'm new to 300 BLK and to suppressors and wanted to ask for advice. Thanks.