So went out to the range today to shoot 270wsm. Reloads of my own. Out of the box of 20 I had 2 cases where the neck split. One half down to shoulder the other down to shoulder. History of brass. Bought factory loaded win. Box shot it. this was the second time I have reloaded it. Load. IMR 4350 58 gr with 130gr SST bullet. Redding dies FL resize. The first time I reloaded I had issues with working the brass as the only thing I have reloaded is 223 and 9mm which you can teach a monkey to do. The rounds were not fitting the chamber but I have that worked out now... Could these two split case necks be due to over working the brass and/or having my FL sizing die set incorrectly? Thanks in advance for the help!