obduration

Related to obduration: encumber

obduration

(ˌɒbdjʊˈreɪʃən)
n
the process of becoming or the state of being obdurate, intractable and indifferent
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
In the present study, neither of the two obduration materials provided a void-free filling (Figure 1).
It was always their belief that most problems with the 90 grain jacket failures had to do with rough obduration of the base.
When obduration happens powder gases don't seep around the bullet and melt miniscule particles from it.
I will not be able to resist also opining on some of the problems we face as judges because of the xenophobia and obduration of some appellate judges and politicians.
There is also some excellent advice on bullet obduration, fit in revolvers, and more basic reloading tips.
Resistance is obduration, a pull back, but it is also duration, defense, a barrier against the assault of exterior forces that assault the "healthy" ego in a meta-psychological sense.
Achieving that kind of velocity in a 20" service rile barrel, however, resulted in some really rough obduration and other stresses on the bullet, and blow ups were common.
It does affect the integrity of the sabot and its obduration qualities.
Note, use of chambers with longer throats (overall readings of 2.50, 2.55", etc.) may be helpful in reducing chamber pressures, promoting "softer" obduration of the fragile Sierra 90s, and achieving higher velocities to support 1000 yard shooting.
Obduration is important because barrels in many black powder cartridge rifles vary in groove diameters.
My Service Rifle camp is looking at a more aggressive gain to reduce pressure and soften the obduration of the rear of the bullet.
Sierra concluded that the jacket could have stood to be a little thicker and felt that rough obduration of the back of the bullet was the major cause of the midair bullet failures.