Thread: why???

ok guys here goes
the 7.62x39mm is an ok sort of a round I use one for close range bush stalking but limit range to 150yards maximum
thats a 123-130 grn projectile at about 2400fps
now along comes the new kid on the block the 6.5 grendal
they tell me its the same case...fires a 123-130grn projectile at 2600fps
yet its all of sudden its the ducks nuts and good for deer at all sorts of ranges 4-500yards


also can anyone confirm that a 300blackout will fit loaded round into .223 chamber??????
that sounds like recipy for a major dental rearrangement
once upon a time cartridges were made so it couldnt fit in similar rifles..eg 30/06 into .270


neither round does anything we couldnt already do yet they seem to be all the rage,anyone care to explain why they are so good because Im begiggered if I can see it.