I have Sinman making me a 300 blackout barrel now. Please chime in if you folks know any thing about trailboss and the 338 federal/300 grain or the 300x221 (acc blackout) or any other possibilities that I may be overlooking. Max range subsonic cartridges used with pistol suppressors actually has a lot more options than I ever realized. I am even considering the 300 blackout which is apparently frequently used effectively with a 9mm suppressor and has reasonably comparable ballistics when used with heavy SMK or VLD bullets (I need an excuse to try the new berger 230gr) and Everybody apparently has reamers and loading equipment for it. I will be exploring further into trailboss to confirm. Any subsonic specialty round I pursue needs a high bc projectile to make use of what little velocity is available in a subsonic round.I read about some trail boss use but heard (unconfirmed) reports that the 338 federal would not hold enough powder for the 300 grain SMK or Berger which are the only 338 bullets. Thanks for the idea but the 358 lacks the hi bc bullets I need for longer ranges and I want to do this project without buying any more suppressors, I do not need any supersonic capabilities or versatility in this project. Thanks again, but I am still trying and find one. The spectre appears to fit that agenda like no other as I expect the larger 338 subsonics would produce enough pressure to require a newer, expensive, heavier can. In summery: I want a very stabile flying, hard hitting, low pressure cartridge in a bolt action platform using a suppressor I already have funded by a carbine I have but am not emotionally attached to. That same 9mm carbine is worth enough to fund this whole project and the only part of my collection that has not yet earned a positively permanent position in my collection. The 9mm carbine I have the can on is super accurate out to about 60 yards but after that it is just slinging lead.

The interest in the 338 spectre cartridge starts with it's very stabile ballistics using the 300 grain bullets but more importantly the recommendation that it be used with a 9mm aluminum can (like the gemtech raptor) that I already have and I do not want to buy any more cans). I have a 300wsm light hunter and a 338 edge heavy hunter and getting ready to do a 243 fast twist long range varmint.