I have an AR15 300bo have not shot it yet, i really want to load cast in it but i have run into problem .I have a Lyman 314299bv mould .314- 205 gr gc that i use for my Argie that would like to use ,i have sized the boolit.309 alox lubed and seated into a case at neck deep,seated to fit magazine thing is wen chambered i have rifle engraved into 1/4 of the ogive ,here is the stumbling block.I could seat it deeper but then you go against the common rule of not seating below the neck.I see some commercial boolit like the Leatherhead 240 gr witch look a lot like the Lyman but much heavier and sized at .311.How can they be loaded without jamming into the lands? Then i still have to deal with the magazine but that is a different topic.Can anyone help me figure out this problem?