From: "E.J. Totty", [EMAIL PROTECTED]
--snip--
>I don't think that propellant gasses actually melt bullets, if
>they did I think it would be a problem with military guns
>that do use boat tails with exposed cores.
>
>
>Jonathan Laws.
>--
>But not with the flatbase bullets that Berger makes, as
>Andrew pointed out already. Those would be easier as
>FMJ.
>
>Steve.
Steve, & Jonathan,
Allow me this one hypothesis.
I have a S&W 686S that also experiences leading,
depending on what type of bullet I shoot.
My thoughts are that in unjacketed bullets, the
propensity for lead deposits is a matter of fact because of
the way lead behaves under pressure, and due to the fact
of its softness. Since metal in gun barrels -- especially rifled
barrels is not anywhere near a glassy smooth surface, and
because lead acts as its own lubricant (much as a brass
bushing will act as a lubricant to a steel shaft in slow rpm
devices), then lead will deposit to the companion surface
it finds itself against - even hard alloy lead.
The matter of soft lead is not so much the problem
as the state that lead will find itself in the presence of heat.
The softer the lead I believe, the greater the
propensity for it to turn plastic on its outer molecular
surface. If this is the case, then is would seem an easy matter
to solve for by merely treating it with a conversion coating
for its outer layer. I have no chemical in mind, but there
possibly is something 'out there' that might work well.
Lead doesn't have to melt to become a problem,
merely soft enough to leave traces of it on the companion
surfaces of the cylinder bore, and barrel, respectively.
ET
--
I'm not sure what causes it, but I'm convinced it happens.
Perhaps the friction of the bullet against the barrel
generates enough heat in the projectile that some of the
lead at the base of the bullet vapourises, or perhaps
it is as simple as the pressure built up pressing on
the base of the bullet and knocking it out of shape.
9x25 Dillon was notorious for having problems with
FMJ bullets. I can't believe it was simply the shooters
imaginations. One of the main reasons 9x25 Dillon is
so rarely used is because people can't afford to buy
JHP bullets to load it with. I have heard some say
this is all to do with the OAL length of cartridge,
but Rob Leatham and Willy Peache both told me that
FMJ bullets simply melted at the base. These guys
between them probably shoot more ammo than everyone
on this list put together, so I'm not going to
simply ignore what they have told me. Who knows,
maybe some idiot told them this and they believed it
and simply repeated it!
I will look into it a bit further as it was several
years ago that I had these conversations.
Steve.
Cybershooters website: http://www.cybershooters.org
List admin: [EMAIL PROTECTED]
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