I have only been reloading for about a year now, and thought I had a pretty good handle on the process. Up to this point, all I've only loaded 105 gr Bergers for my 6BR, and decided I would try out an 80 gr for the 100-200yd range. The process I followed was the same way I have been doing all along, but these 80 grainers have a flat bottom versus the boat tail on the 105s. The results have been frustrating, not because of accuracy, because I haven't shot them yet, but if the bullet is not started precisely, the lip folds under and fouls up the neck.
After consulting a very experienced reloader, he advised me to chamfer my necks a little deeper to help guide the bullets into position.
Most of you probably knew this already, but those of us less experienced reloaders might benefit from this little bit of insight. If anyone has other techniques to help prevent this sort of thing, please add them to this posting.