220 vs 240 Sierra Match Kings

[RobRat]

Playing around with my 300/221 1:8 twist AR upper, developing some subsonic loads while awaiting the BATFE to approve my Suppressor purchase...

Finally got the bugger cycling 100%, AA1680 was the answer. Loaded up some 200 SMK's and shot them at the range, and once I got down to 11.0 gr, heard that "whump" from the bullet hitting the berm. Wasn't able to run them through the Chronograph, as thr range was too busy to set it up.

Anyways...I'm looking to buy bullets for shooting subsonic through the suppressor. The prices below are from Midway.

240gr SMK's are pretty darned expensive, and aren't available all of the time- -I've shot them, they seem to be stable, no keyholing. (I've not seen anything but nice round holes in any of my targets while testing loads for that matter) $56.98/100 (come in a box of 50)

220's seem to be readily available, and are a lot cheaper that 240s. $38.99 (come in a box of 100)

210 SMK's - these seem to be the bullet that the long range guys are shooting, and as a result, and pretty pricy, and just as hard to get as the 240's - $54.98/100 (come on a box of 50)

200 SMK's - I can get these down to subsonic velocities, still cycle the action, and they are readily available locally. I have not accuracy tested them, so I don't know what to expect there. $34.99 per 100.


I'm leaning toward the 220s for the best weight per $. Is there any reason NOT to use them in a 300/221? Are they stable at subsonic velocities?