![]() The 300-221 Fireball shoots bullets with ballistic coefficients (BC) that are much higher than the. But the original post wanted to reach out and touch targets out to 300yrd. But it only makes sense, at least to me, to tryĭude, after today I'd say the best sub sonic AR load is a. Great, if not then then you offer the best available. I know of a couple people who have had good luck with subsonic Grendel loads. It would be a good choice for him to try first simply because he already has everything to give it a try. Lastly, several people have reported getting satisfactory results using a 9mm can with the 300-221 Fireball. The 300-221 Fireball also uses standard Ar15 mag and bolt/carrier. With the gas port in the pistol position you do not need an adjustable gas block to be able to shoot both super and subsonic loads. They all shot well in my four 300-221 Fireball Ar15 rifles I have also shot 168 thru 240gr bullets subsonic. The lightest bullets that I have shot subsonic in the 300-221 Fireball is 147gr Win FMJ. A 150gr bullet can be pushed to ~2020fps and and also be shot subsonic. You can load 125gr supersonic bullets up to 2250 fps (from a 16-in barrel), matching the 7/62x39. I think that the 300-221 FIreball is the more flexible than the 338 spectre. You probably could get the 7.62x40mmUS to work, but you will also have to work out the charge density problems. If you are looking for the optimum subsonic caliber you basically have only two choices. You will get very large velocity changes with the different powder positions due to the low charge density loads. The second problem that you will have to overcome with subsonic 6.5 Grendal loads is the excess case capacity that you will have with the light powder loads that are used for subsonic loads. ![]() I suspect that you will not get your standard 6.5 Grendal upper to cycle reliably with subsonic loads. This means that you are going to have to get the action to cycle at the much lower pressures that the subsonic rounds will operate. You did say "subsonic" right? If you did, then the 6.5mm Grendal, as suggested by Gunwritr, would be a poor choice For several reasons.įIrst, It sounds like you want to shoot the subsonic round in the AR platform.
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