The brown bear is laquer/polymer coated steel cases. The silver bear is Zinc plated. The golden bear is brass cased. The silver bear should not leave any residue behind other than carbon from the dirty powder.
IMHO, if you just shoot the inexpensive domestic ammo like Winchester white box or Federal red box, you pay a little more bit have reloadable cases left over that you may find a use for in the future.
Co-worker has some issues with his flat top firing Bear .223, he would run a 30 rounds and then the jamming / misfiring starts - might be from the laquer/polymer coating (not sure). He has had enough, I advised him to use the remaining rounds 30 only per visit to the range and fire winchester, pmc, etc.
I wish I could provide other details - on the malfunctions with the bear! I have had numerous attempts to get hime to the range; however, honey do list comes into play!
Wednesday, is a coming and it is range time; however, the winds will calm down! If the winds are going, time for drive to the Gun Show this weekend 1-2 May at the Expo Hall in Albuquerque!
Last edited by Bigcountry02; 04-27-2010 at 07:56 PM.
If you look at the design of the Russian ammo (7.62 X 39 and 7.62 X 54R) they both have pronounced body tapers. The .223 is a nearly straight bodied case (from base to shoulder). I believe the taper of the Russian case works fine with the laquer/polymer, but the US designed .223 was never designed for and does not reliably work with the coated ammo.
Remember, the case serves two functions..1 as the recepticle that contains the primer/powder/bullet and 2 the gasket that seals off the chamber. A steel case will seal off properly when tapered like the Russian ammo. Steel will not expand properly to seal the chamber in a straight walled case like the .223. Mikhail Kalashnikov and Sergei Simonov understood this and designed their rifles to take advantage of the ammunition's design.
IF you choose to shoot laquer/polymer coated ammo in .223, be prepared to clean the chambers VERY well. You should almost expect malfunctions if you let the barrel heat up.
Personally, shooting cheap ammo through an expensive rifle is like using re-refined motor oil in an expensive sports car.
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