I have shot in a few bench rest shoots with bolt guns. Just small local shoots but I always did well. I have a couple of rifles that will make one big hole out of five shots at 100 yards.
Well I just got a DPMS 24” SS .260 Remington upper for my Tactical Machining lower, with a JP trigger group; http://www.dpmsinc.com/store/products/?prod=1991&cat=1605
It came yesterday and it’s a heavy monster. It fit on my lower perfectly. I had several different loads ready to go and I couldn’t wait to try it out.
Yesterday didn’t go so well. I put about 50 rounds through it cleaning after every round for the first 25 as DPMS recommends, then after every five rounds. The best I could do is about a 3” group at 100 yards. Not nearly good enough for even a hunting gun in my book.
I didn’t sleep well last night thinking I had just blown a wad of cash on an upper that was a disappointment.
I took it out again today after a good cleaning, and the first group was right at 1”. There is hope for this setup after all.
I tried five different loads from 100 grains to 140 grains.
The 100’s were all over the place, too light.
The 140’s were loose, too heavy. This barrel has a 1 – 8.5 twist, and the 140 grain bullets said for 1 – 8 and faster.
The 125 & 130-grain bullets shot close to an inch over and over again. I hope I can tighten up the groups with a little load tweaking. Also DPMS said it would take about 200 rounds to break the barrel in, so time may help, and I’ve seen that with some of my bolt builds.
Anyway lets help each other out here, and maybe learn what works best in these semi autos.