Originally Posted by kjdeut
In the Lee loading manual it reads like a full case resize should be done for semi autos regardless if previously fired in your weapon or not.
Originally Posted by rjd3282
Neck sizing is for single shots and bolt actions. Semi auto's should be full length sized. ... Target shooting is another matter.
Originally Posted by mseric
Correct, always Full Length size for semi-autos, always.
say always FL resize for semi's or you will have chambering
problems. My experience is different.
I have a match grade AR; I neck size for it, I have never once had a single
feed issue with it using neck sized ammo. Now I only neck size my match
ammo; it does improve accuracy, when shooting from a bench I get as much
as a 50% reduction in grouping sizes, there are other factors than just neck
sizing, bullet choice, the degree I have tailored that load for that particular
rifle, etc. But I do not have any issues with neck sizing and feed issues. I
will add that the neck sized ammo is fire formed in that rifle only, then then
shot only from that rifle and is kept separate from all my other .223/5.56
Now with my general 5.56 NATO load, they all get FL sized ammo as they
get shot out of any of 8 different firearms; my 4 AR's, my son's Remington
Model 7 and my reloading partner's 3 AR's.
I will also agree that hunting ammo should be FL sized.
There are also small base dies for ammo that is commonly shot in semi
actions. These dies size the case to even smaller dimensions than standard
FL dies. I have not used them; as I have never had and issue with feeding
in any AR with my FL sized ammo.
Just my two cents worth; your mileage may vary.