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Petamocto said:Ack, but at a cost of more recoil which may be more acceptable in a sniper role but not the best thing for a sharpshooter who may have to fire rapid rate.
Don't get the wrong idea here, I still agree with 99% of what you're saying ;D
Okay I see your thoughts.
The 5.56mm improced loads do not increase recoil, in fact the 70gr Black-Hilsl loaded Brown-Tip has slightly less than M855, and decreased cyclic rate as well.
Some of the 7.62mm rounds, like the Hornady SuperPerformance are inded increased recoil.
I took an excerpt from a poster on M4Carbine.net with two of our guns using this.
A 16" SR25 EMC with a good modern load like the Hornady 168gr TAP Amax will get you to 800 yards very consistently - provided you know what you're doing (mostly reading wind). You won't be winning any F-Class matches with a 16" gun, but you can ring steel at 800 all day long.
I have both the 16" EMC and the 20" EMR. The Hornady load above sees about a 90fps boost out of the longer barrel. More MV is always good, but 90fps is, IMHO, not worth buying another rifle for...
The real reason I got the EMR is to experiment with Hornady's new 178gr Superformance round. The Superformance is very hard to shoot out of a 16" gun -- recoil is very sharp and it does not group all that well.
This round is HOT: 2684fps out of my 20" tube at 900' ASL, 70degF -- an easy 1000 yard load. Some have experienced popped primers, even using a bolt gun. It remains to be determined if this is a pressure problem or an ammo manufacturing problem. I have not experienced any popped primers over 50 rounds, but I will continue to treat this round as experimental in my EMR until I can gather more data.
The Hornady 155gr 8087C is not like the 178 SuperPerformance, and I really don't know a lot about its longer range performance, just its in close (300m and in) work, and the terminal performance in Ballistic Gell.
The biggest problem when you step out of M118LR is it is the only ammo in 7.62mm that has both a specified chamber and port pressure, to which the guns have been set (at least our SR-25's).
When you play with either of those, you can dramtically affect the bolt carrier velocity, and that effect reliability as the extractor and ejector are desgined to operate withing a certain parameter.
Now those parameters are farily generous, as we can use several different ammunition both suppressed and unsuppressed. But we do have over 100,000 rds of M118LR that have been fired on US Army acceptance and endurance guns that are analysed to the nth degree and fired in a controlled environment, and everything is inspected and tested at given periods.
several of our Foreign customers use their own ammuntions, and we have delivered a lot of systems without complaints of function.
But my concerns with the "Super Performance" ammunition is that it may result in decreased reliability, and increased system wear. If an entity was to specific the use of that ammuntion, we would test it very thoroughly.