I have a question for the M14/M1A builders on here. I recently built a rifle for a friend of mine, Kreiger heavy, McMillan stock single lug Springfield receiver. The barrel was short chambered from Kreiger, I headspaced on a lathe until it was close, within a couple of thousandths. I installed the barrel on the receiver and checked headspace. The bolt would close almost all the way on a "go" gauge, bolt was within .025 of all the way closed(fully engaged on receiver lug surface). The reason I did this is I have noticed that most bolts do not bottom out in the corresponding receiver surface( correct me if I am wrong but that receiver lug surface is somewhat tapered?) On test firing with the gas system turned off I checked the fired case and the case gauge read 1.632. Am I missing something , I don't believe the receiver can stretch that much, shouldn't the fired case read 1.630. I realize it's only .002 and I have checked my case gauge with my headspace gauges and the match. Neither I nor my friend are concerned about the .002 I just like to be precise.