I recently aquired a LBT mould for my 30br. I did the lead slug thing as they suggested and sent them the case and plug used. I told them what I was shooting( twist etc,) and said make a bullet that they thought would work. I used to cast bullets commercially. In all, I have over 40 moulds and have access to 30 or 40 more. All of the blocks that I used were cast iron or cast steel. The LBT mould came. I opened the box to an aluminum set of blocks with a sprue plate that I didn't think was near thick enough and couldn't do the job. I opened the blocks to find only one set of air vents. At that point I was disheartened. Maybe I wasted my money. BOY WAS I WRONG. THIS IS THE BEST MOULD I HAVE. First of all, due to the fact that the blocks are aluminum they heat up in no time. Even with preheating a cast block it still takes me 15 or so pours to start getting acceptable bullets. Not with the LBT. From a cold mould it took 12 pours to get good bullets. The cavities are well centered. The bullets fall out when you open the blocks and they are round bullets that weigh the same. Due to the inclement weather I haven't been able to shoot any of the new casts but if the shooting goes as well as the casting has, a shooters paradise can't be far away. THANK YOU LBT. :dude: