Popular Supersonic 300 Blacklout Mold

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.

I have the Lee 312-155 in a 6 cavity. I had a little problem with it initially, which was admittedly my fault. If I had been doing things right, I would have been droping nothing but perfect boolets the whole time.

I'm still in the process of working up a good load, so I can't speak to the overall accuracy of the boolet, since there are to many variables that could be affecting my accuracy right now. Things are looking positive, however.

I've tried HTC and PC, and so far don't notice a difference between the two. I've tested with gas checks, but I do have around 20 rounds ready to go without gas checks just to see what happens.

Overall I'd say you really can't go wrong with the Lee. If you're really worried, get the 2 cavity for $20. If you end up not liking it, you're not really out much money, and you can always bump up to the 6 cavity if you end up liking it

I also have the lee 6 cavity and it shoot great. GT bullets has the MP 311410 cast for sale. I just bought 500 to try in blk out, 308, 30-30 single shot, and 30-06. The Lee 312-155 I load with lil gun powder. I am pushing it a little over 1900 fps. Boolits are water dropped from the mold and yes you need gas checks. The 311410 is a little short to feed from my ruger in 300 blk when seated to crimping groove. I seated it about 3/4 of the first driving band and crimped it and it feeds in the ruger and my AR. Iwont have a chance to shoot till sat and will try that boolit/load for the first time. The boolit just starts to engrave the rifling in both rifles when seated out like that. I size the Lee to 311 and it shoots fine..Watch your case neck thickness or you will stick one in the chamber and it wont come out without help. I learned to use a screwdriver thru mag well to gently pry the bolt/cartridge out of chamber in AR.

The Lee 312-155 I load with H110

I have that mold in 2 cavity and when they came out with the 6 cavity I purchased it as well. For supers in 300 BO it is very hard to beat.

I always had my best accuracy with the rcbs 165 sil bullet , the lee 185 and the 155 shot well also in my rifle.

The Lee 155 is the most reported to be easy to use and get good results with on this forum, bar none. Use it myself.

I know somebody that says that an NOE Spitzer boolit is the only way to fly for 300blk supers. Problem is I can't recall the number. It's a little lighter than the Lee. Maybe the Other Duke in Florida will chime in at some point.