I have asked this before but cant seem to find the old thread.
Whenever I cycle a round in and out of my para p14, the bullet comes out pressed or seated deeper into the case.
Ive tried this both on local ammo and imported rounds. the result is the same, overall length of the cycled round shrinks.
It happens with just one cycling.
Whats wrong with the gun?
Is it safe to fire the ammo if the bullet is seated deeper than usual?
Bullet setback is a reality, especially in pistols with
steep ramps (as in most locking breech designs --less so
for most fixed-barrel blowbacks), and particularly with
non-factory ammo, which isn't crimped as stoutly.
Most US factory ammo is rated for only two (2) chamberings
and unfired extractions.
Bullet setback increases case pressure when the cartridge
is finally fired, with potentially disastrous results for
high-pressure cartridges like, say, .40 S&W, for which a
setback of merely 1/10 of an inch can DOUBLE the resultant
case pressure.... so be very careful.
You shouldn't get setback in factory ammo after just one
chambering. Either those are actually reloads, or your ramp
could use some polishing. There is also some data to suggest
that dimpled (or pimpled) followers help minimize unproductively
(and unnecessarily) hard contact between the bullet and the ramp.