![]() ![]() People have developed smaller and lighter versions, but they are specialty, and tend to be less proven - and quite pricey. That takes speed.īut with that, the most common AR10 patterns are just massive pigs. It's whole point is to be able to reach out to distance, and do it flat and accurate. The entire purpose of 6.5 CM is a distance engagement precision round. I have a very nice shooting 20 inch, 6.5CM barrel for my MWS, and I am considering having it cut back and threaded for my Sandman K. So if one is shooting in that 600 to 800 yard range, does it make sense to go with a longer barrel, especially if one may be thinking running a can on the rifle, one has start thinking about what they may gain from a shorter set up. Now if one was out west with longer sight lines and stronger winds, well, the longer 20 inch barrels really make a lot of sense,ġ40gr, Sub sonic at 1100ish, 1.58 wind drift(48 inches) at 800(10MPH)ġ40gr, Sub sonic at 1200ish, 1.38(43 inches) wind drift at 800(10MPH)ġ78, sub sonic at 1100ish, 1.98(58 inches) wind drift at 800(10mph) if you are in a wooded area with limited sight lines one could easily get away with some like a 14.5 to 16 inch barrel, KAC has been doing development of their 6.5 guns and have found that a 14.5 6.5CM is ballistically pretty close to the 20 inch 308 barrel and their M110's, so unless you are really shooting past 1K, a shorter barrel makes a lot of sense. Combine that with a 6.5 Grendel in your armory, and you're really set.Īs with everything it really depends on your how you plan on using the rifle. So in my own assessment, in an common AR10 20" is the most generic general compromise BBL length for 6.5 CM to get it's potential without getting just a massively oversized gun. Look up a 6.5 Grendel with a 20" BBL, that fits on a light standard AR-frame, and it's not bad and still lighter than even a 16" Creedmoor. If you're willing to shed speed to save some weight, that's what 6.5 Grendel is for. 18" can help with the weight and mass but at the expense of losing some of that all-important Creedmoor speed. In my opinion, 20" is about as long as you want to go for that, and is a standard length AR BBL for a long time. Putting a really long BBL on that, turns an already heavy pig into just a big old pig to lug around and use. So most likely you're going to be running a common LaRue/PSA/DPMS/Knights/et-al sized AR10 frame. People have developed smaller and lighter versions, but they are specialty, and tend to be less proven - and quite pricey. That takes speed.īut with that, the most common AR10 patterns are just massive pigs. It's whole point is to be able to reach out to distance, and do it flat and accurate. The entire purpose of 6.5 CM is a distance engagement precision round. ![]()
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