Lead Lobber, All my 204 brass is still within case lenght specs i have not trimmed any yet.

Valar, Just to be clear, you are saying i should file the metal on the mag? Not the grooved ramp on the gun? In case there was any question this is my first AR and i have not been reloading very long.

Stien, my shell holder is touching the body of the die, I gusess i dont understand how lowering it any further would change anything?

in regaurd to the chambering issue, i do FL resize with rcbs dies. Yes the problem is only with reloads. never had a problem with new brass or factory ammo. The only variation in dementions i can find is the witdth at the shoulder, all my books spec 0.360 after resizing i have 0.359, my factory ammo...

I have a bushmaster with the factory mag and a 20 rnd mag wich is not stamped 204 and the cutout on top is alot different the factory 5rnd mag stamped 204 is more open on top, having said that the 20rnd mag works fine. I also bought some cheap plastic mags stamped 223 only to find that the shoulder ...

Hi, I am strugling with two things, 1st a high percentage of my 204 reloads don't chamber all the way even with the use of the forward assist resulting in a miss fire, usually if the first round chambers properly the rest do just fine. this never happens with factory or new brass. the dies I'm using...

I have a bushmaster AR in 204. and rcbs dies and it has been a little tempormental with brass that has been fired i fullength resize and somtimes the first shell will misfire if the first one does not misfire all is good, its a little inconsistant though maybe a small base die is the way to go . i h...

I have the bushmaster predator 204 from cabelas also, after putting a gisele trigger in it i love it. I mostly coyote hunt with it and cant think of a better set up for that its light and fast and the 18" barrel seems to shoot well. havent shot much past 300 , several coyotes past 200. the 1-12...