So until now I have been religiously buyng a case gage checking die for each rifle caliber I reload. Usually don't test each batch of rounds (if full lenght sized) but I often I do it with neck sized batches. Yesterday whent to the range with 50 just reloaded rounds and discovered that plenty did'nt chamber in the wide chamber of my Remington R5 308 rifle. I remember having revised the heads space setting for this die before starting reloading that last batch of rounds and I am fairly shure I passed them all throu the lyman 308 gage before fitting them the range box. Nevertheless at least half where impossibly to fire and the rest did made the bolt stiff to close (shoulder bumping non enaught). I didn't shot one and admit I was so frustrated that as soon at home grabbed the cinetic hammer and dismantled all as a fool. Stupid behaviour cause I should have done some mickhing before. I then shortened one or two tens of mm the shoulder bumping and full sized alla the brass again. Problem gone but.... do you thrust the commercial HS dies shaped gages (like Lyman, Redding, Wilson) for avoiding this problem?. Or I better test each new batch shoulder bumping with a gauge like the HorNady Head Space (wich I have) and mics the other main measures before starting droping power in the brasses? I ask this because this is the fisrt time this issues rises in a so big number of loads but seldom I experience some stiff or difficoult chambering round also if the faulty round had passed the gauge test.