Hey all, been awhile since I've posted here and hoping to get the Hide's advice on an upper build I am looking at pursuing. I currently have a 16" 223 Wylde build that is my do all rifle based on a Seekins lower with LMT SOPMOD stock, Spikes T2 buffer, Tubbs flat wire spring, and Geissele SSA-E trigger. I'm looking to build two additional uppers, one in a 300blk for CQB work, and a 6mm offering as a DMR type platform to reach out to the 1000m territory and possibly use in PRS competition.
For the DMR build precision and reliability are my top priority, which has me in the pickle over 6mm ARC vs 6mm Max. I've read a lot about both cartridges here and elsewhere, and while 6mm ARC has more history and development, I'm concerned about some of the things I've read about reliability. Magazine feeding (although it sounds like that's been getting better with newer designs) and bolt lug/extractor failures. I've also read about the 6 ARC running excessively dirty particularly when suppressed, which I am planning on running a suppressor for this build (probably a flow through design that would hopefully mitigate some of dirtiness). That being said, 6 ARC sounds like it handles the heavier projectiles better that would be suited for long range work (I'm thinking about 20-22" barrel for what it's worth).
Now onto 6mm Max, I like the idea that on paper it sounds more reliable using a standard 223/5.56 bolt face. But I know it still requires proprietary magazines, and there's been very little development/literature out on the cartridge. I know it also won't handle some of the larger projectiles over 105 grain.
So should I try the new kid on the block that might fizzle out completely (6mm Max), or go for the more tested but possibly more finicky 6 ARC? I do reload so factory ammo availability isn't as much of a concern for me. I appreciate any guidance you guys have!
