I loaded up 8 rounds (.243) & went "testing" today, I was very careful and took my time doing this. Read 3 different books & watched 2 different cd's. When loading I used the following as per Hodgon's load tables. New, never fired Winchester cases,ran them thru resizer die. Checked case length and adjusted as needed,Primed using CCI Lrg rifle primers, Loaded w/41gr of Varget. Bullet used was Nosler 55gr spitzer ballistic tip. First one fired showed what i would call excessive buldgeing in the shoulder of the case, 2nd same results. I STOPPED there. Had some factory rounds w/me also, fired those & they look fine. One thing I did notice was the factory cases were not chamfered, I did chamfere mine as per RCBS recomendations. Any ideas out there as to why this happened or what I might have done wrong ? Any help would be greatly appreciated..