SD Rifles

Let me preface this and say, I do not have a barrel or an upper yet.  With that said, I am quite familiar with the 6.8SPC case dimensions/design. The 224 Valkyrie is not a new cartridge, these companies are just taking a wildcat cartridge that has been around for quite some time and making it a mainstream, factory round.  I first heard about the 22/6.8 was in 2007.  Wildcatters were really talking about using it for predators back then. So, the new cartridge is being pumped up as the best thing since sliced bread for the small framed AR-15.  This is to be expected, that's what marketing departments do, they tell you what they want you to hear.  The videos of it going to 1300yds and staying supersonic are impressive and I don't doubt its capable of that.  The heavier bullets have great ballistic co-efficient's(BC's). The question you must ask yourself is, What am I going to use it for?  Answer this honestly to yourself.  Are you using it ...

This list is a personal opinion, that I formulated through my experience over the last 20 years of hunting and building these rifles.  These are for predator hunting.  Here we go! 10.  17rem:  A very fast, short range caliber, primarily used for fox and bobcats.  Although a properly placed bullet will kill a coyote, its just too light to be any higher on the list. 9.  20 Practical:  My favorite short range caliber. I personally use this round for targeting fox and bobcat. Its a 223 case necked down to 20 caliber.  Easy to reload for and brass is readily available.  If used for coyotes, select a faster twist barrel to shoot heavier bullets. 8.  6.8 SPC:  I refer to this cartridge as "THE ROCK", its .277 caliber bullets hit hard, really hard, but they're ballistic-ly challenged for distance.  Those who don't shoot past 300 yards will find this to be a great hunting round. 7.  300blk:  The blackout is a sawed off...