I've shot for many years as well. Many many 6BR'S and 6.5 x47's...all shot best with 450. PPC's always liked 205 and wolf primers. Different barrel makers and twist....JEFFPPC is correct...go test! Many good primers!I have been shooting 6brs and 6brxs for 20 years, never had any mag style primer as my go to.Test, use what shoots best in your barrel. Anything else is just opinions that may are may not be the same as actual results from your barrel.It also depends on your type off shooting. What may give you the smallest 100 groups may have a big ES and not work so well at 1000, or it may. Your targets from your barrel will tell you is my point. Not what others have done.Test, test, test.
Inquiring if anyone has experience with using non-magnum primers with 6BR ammo? That may become the only primers available once my current inventory of CCI 450s is depleted.