I am awaiting arrival of my first M1 carbine. I had an individual donate some brass to me for reloading. I was told it was sized and trimmed to proper length. Well I went through each piece today checking length. Majority of the brass was trimmed to 1.260 - 1.269. About another third was trimmed 1.270 - 1.277 and 30 pieces were trimmed to 1.278 - 1.285. Since this round head spaces on the case mouth and should be trimmed to 1.280, is it safe to assume that all the brass shorter than 1.277 is basically trash and should be thrown out? If i resize each piece again, will any of it stretch out to 1.280?
TIA
rdwarrior