Robbo i'l admit, i havnt fired .50 cal, i havn't inspected it, and i am most certainly not a physicist. But, looking at all the evidence provided so far (which i will agree to being preliminary and mostly hypothetical data) you have to think that .50 cal does carry some flaws to it.
I can also understand a point of view that everything when it starts off is to be evolved and redesigned and the flaws worked out. So although Dev may not be a physicist, he has picked up on that there may be a flaw with .50 cal. However i do not think it is with the shell, before i comment here i have to add again, i am not a physicist, but, since .68 tourny grade shells are perfected (arguable opinion i know but humour me), does it not stand to reason that .50 is simply a scaled down version of .68, therefore although the size of the round is smaller, a similar ratio of shell density to fill will bring promising results? And in breeches, yes, the shell thickness will be reduced, but thinking logically, because there is less weigh being proppeled (.50 cal being lighter than .68) would it not stand to reason that not as much force is required to move the pellet and therefore less force will be exerted onto the shell meaning that the redefined tollerances and dimensions of .50 cal shell will allow it to fire without breaking int he breech as you mentioned?
However i cannot comment on the velocity issue, that realy IS for physicists to analyse. The modeld outcomes and performances of .50 cal did not lok promising. But im sure those clever clever boys and girls with big shiny deplomas who are very excentric will solve it!
And Robbo, i will say that as successfull as Richmond has been, and he may well be right again (which is of high possibility) that even the smartest people and the most successful people make mistakes. Stephen Hawkins (arguably the smartest person int he world) has made mistakes before. I am not condemming Richmond or his investment, but people get things wrong. Remember, i am not condemming Richmond, nor am i condemming Dev, but we need to see how everything pans out.
.50 cal needs to be given a fair chance to shine and prove itself before it can be fully judged. Yes, people can look at the pros and cons (as i have done earlier in this thread) but judgement cant be made until it has had a chance to blossom.
I know any number of people could probably flame this entire post, but its only an opinion, id rather be proved wrong and discuss my opinion than have it flamed though guys!
Cheers