From: [EMAIL PROTECTED]
<< everyone I've spoken to says the Sierra bullet is best for
300m, it tolerates jump better than a VLD (or rather it does,
whereas a VLD doesn't) >>
Can someone expalin that to me please? What is "jump" in
this context?
Kenneth Pantling
Bad laws are the worst sort of tyranny.
(Edmund Burke�1729-97)
--
Bullets usually jump from the case mouth into the rifling,
unless you handload very carefully, that is why (as far
as I am aware) there are no factory made VLD loads, because
the ogive of a VLD is what gives it "very low drag" but
also makes it less tolerant of the jump. Sierra MatchKings
have a thicker jacket and a more tolerant shaped ogive.
This in theory means they will be less accurate, but
it is possible to assemble a factory load that is at
least reasonably accurate in a factory standard barrel.
What organisations like the USAMU do to save on handloading
time is to tailor the rifle to a factory load like
Federal Gold Medal, so that there is no jump but they
can buy ammo in bulk. Hence they get 0.2 MOA at 300 yards,
whereas you'll probably get something like 0.5 MOA with
a good quality factory made 5.56mm rifle at best with the
same ammo.
Swiss Ammunition Enterprises have loaded 5.56mm for the
USMC including with an 80gr VLD to their specs for their
rifles (for 600 yard courses of fire), because the USMC
have a lot of identical match rifles with identical
chambers, so they can specify the OAL of the load that
they want quite precisely. I don't think anyone else
would be that fortunate!
I don't pretend to be an expert on the handloading of
rifle ammunition, no doubt there are other subscribers
who can provide more information.
Steve.
Cybershooters website: http://www.cybershooters.org
List admin: [EMAIL PROTECTED]
___________________________________________________________
T O P I C A The Email You Want. http://www.topica.com/t/16
Newsletters, Tips and Discussions on Your Favorite Topics
