I took my new Navy Arms .308 Jungle Carbine to the range today and have a question.I was shooting Portuguese milsurp 147gr.fmj`s.Accuracy was good with 1.5" groups at 50 yards.(it was cold and snowy so I didn`t venture out any farther)Here`s the problem.Extraction.I had to lightly tap on the bolt handle with a plastic mallet to extract the fired cases.The cases were noticably swelled starting .1"above where they neck out above the base and there was some roughness in the shoulder area.I didn`t have any other loads with me so I don`t know wether to be suspicious of the chamber dimensions or blame the ammo.I was only able to extract 2 rounds out of 20 fired without using the mallet.Any thoughts,suggestions or advice will be greatly appreciated.