How do you get the quote box ?
(The M16 will set the shoulder back a thou or two, if you let the bolt slam on a long head to datum round.)
Yes they do . I actually did my own test on this to include complete bolt , stripped bolt as well as every configuration in between .My results showed the BCG slamming home would set the shoulder back as much as .002 with most being .001 to .0015
There were three interesting things that I found as a result of these test .
1) If you continually chambered the same cartridge it would continue to have it's shoulder set back in the increments stated above .
2) The continued set back would stop happening at around .004 to .006 of total cumulative set back . After the cases reached a total on .004 of set back it dramatically dropped off , with some but very few being set back more then that .004
3) The set back would only happen if you started with minimum set back . Meaning you started with the cases shoulders only bump .002 to .003 from fire formed measurements . If you first sized the case .006 short of fire formed size . The case had no shoulder set back
There is actually a forth . That is I was able to get a case sized to long ( about .002 ) to still be forced into the chamber by the force of the BCG slamming home although I did not test that more then twice .