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1. What barrel length allows all of the powder to burn?
I don't know but prefer a 16.25" barrel for suppressor use.
2. What is considered the optimal barrel length in an AR platform?
16.25"
3. If one is using 200gr-220gr bullets, what is the best twist rate to use?
I'd pass on the smaller bullets and use the 240 SMK's... in the subsonic world the only way you can gain energy is with heavier bullets not to mention that the 240 grain bullet has a better BC.
4. What size Suppressor seems to work the best? 9mm? 308?
I have a AAC Cyclone that works great on everything from the 300 Whisper to the 300 Win mag.
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