300 BLK AR Boolite advice need some!

<p style=”text-align: left;”>I have bought several of your molds last the one the MP 311-410 HP Mold (Multi Choice) and it did not work with the semi auto magazine both 223 and 300 blk did get it to work with it not even being set to the lube ring. I would like to know what is the lightest mold you suggest that will work?</p>
I have bought 5 molds from you all and sent about 6 emails in the past 3 months asking this question I understand your busy and all yet I’m looking to buy one that works and hate to have to go to someone else to get that done.

 
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