10-16-2019, 02:53 AM
Former Cav Wrote:I bought a bear creek arsenal 18 inch upper with 1 in 8 twist barrel. I put Mag pul MBUS PRO sights on it, Shot some black label hornaday 123 grain bullets (about a buck a round) and they are basically 1 inch at 100 yards. the upper cost about 190 bucks. the sights were around 100 bucks. I have a Larue 17 round magazine, a C products 10 rounder and 26 rounder. They were about 20 bucks each.
I've been working up loads using 8208, Varget, and BL-C2 so far with the 120 ELD hornaday bullets. Got one load that is 1 inch.
Next up is test loads for 123 SST bullets using AR comp powder.
I hope to get a good group of about 1/2 inch. I am used to 1/2 inch or LESS as I used to shoot prairie dogs.
this is my first experience with the Grendel round.
I have a target grade Rock River rifle that I am using the lower with this upper. It has a timney trigger.
27.5gr arcomp shot very good out of my 18" RLGS, but, it was short stroking occasionally. Switched to 30.0gr CFE223. It shoots just as good, and so far everything cycles fine. Oh, I also drilled out the port a couple thou. Good luck with yours.