I have looked through multiple forums in an effort to see if there are any popular supersonic 300 blackout molds in the 125 to 165 grain range for an AR-15. I see mention of the Mihec 311410 and Lee 312-155. Are there others that I missed?
The Mihec 311410 does not appear to be available and I am concerned that the crimp location may not be proper for the Blackout. I am concerned with the quality of the Lee and would prefer something that did not have to be sized down so far.
I am hoping to push the bullet to 1800-1900+. Will I need a gascheck to maintain accuracy and\or minimize leading. I will probably coat with HTC, but could end up lubing.
I would appreciate any comments on the above. Recommendations would be most appreciated.