I made two reloading goofs w/my 338 RUM.
First one was that I didn't realize that I had adjusted the seater die to a greatly increased overall length. Then packed up and went to the range. Couldn't close the bolt on the loaded cartridge.
Not being one to give up easily I applied enough pressure with my palm to get it closed.
I shot 5 shots that way. Right around 1/4 MOA @ 200. Pretty sweet!!!
Except that upon unfired case extraction left the Berger 300 in the bore. Took a pretty good drop with a 27" brass rod to dislodge the bullet. Note I'm too much of a tight wad to simply fire that last round.
That deep seating kept under 1/4 MOA for a long time till I get to thinkin' that it's simply bad deal to have that condition in a sporting rifle.
I backed the COL off until it "just" doesn't stick. 1/4 MOA consistency remained. I'll settle for that.
However, COL is long enough that I need to click the bold release to removed an unfired round. I'll settle for that too.
The other goof was loading that load w/102 gr of 50 BMG. Only moving @ 2735 MV but I'll settle for that too.
I notice no change in apparent pressure with either seating method.
Velocity remained the same for both seating lengths. . . Wondered about that but it is what it is.