Finally got two new guns to the range yesterday -- an AR upper in .450 Bushmaster from Bear Creek Arsenal and the Ruger American Predator in the Grendel. My early impressions of the American series were not especially favorable based on the ones I handled at the Otero County, NM, shooting range where I used to work; while the guys said they were getting very good accuracy, the bolt felt cheap and gritty. Some of the advice at the time was to spread JB Bore Cleaner on the bolts and work them several hundred strokes. Apparently Ruger listened to this and now spends a bit more time in the final machining. No one would accuse Ruger of building an $800 rifle at the sub-$500 price point, but I find this one to be a lot of rifle for the dollar.
Anyway, I got the scope -- a Burris 4.5X14 -- dialed in with Privi 110-grain FMJs at 50 yards, then moved out to 100.
First up was five rounds of the Sierra 107-grain TMK over 24 grains H4198 in Nosler brass with CCI 400 primer -- fairly round group right at an inch.
Then things got more interesting. I switched to the Nosler 120-grain BT over 28 grains of Re15 and got 3/4 inch for five.
My last group was the same bullet over 29.0 grains of Re15, giving just under 5/8 inch.
Since this was merely break-in and familiarization with the new rifle, I was not as careful as I could have been, so I am pretty pleased, and will get back to the range with a proper ladder test. Also have fingers crossed for similar performance from the Barnes 100-grain TSX.
Breeze was 5-10 mph from left to right.
The Bushmaster upper also pleased. Will report in the big bore forum.

I agree, these Ruger American rifles are giving excellent accuracy. Their price seems to be climbing too. I had a slight interest in one in 7.62x39 for a brief time. It was listed on GB, I believe. What caught my eye was the replacement Boyd’s stock and trigger guard. It really changed the look of the rifle.

After handling a few, I still can’t convince myself to open my billfold on one.

Mike, I have a friend in New Mexico who taught my concealed carry class and teaches rifle and shotgun as well. He is a Viet Nam vet, 74 I believe, and with access to multiple rifles, ARs included.
He still loves to shoot competitively and his favorite challenge is the run-and-gun matches held near Fort Stockton in the Pecos country of West Texas.
With his wide experience and choice of tools, he still uses a Glock 17 and his Ruger American Ranch rifle in .223.
I asked him why not an AR and he said, Bill, I just shoot this rifle so well, and it takes AR magazines.
Good enough reasons!

Bill,
My Ruger American Rifle experience was similar. I was looking for rifle in .243W, lighter than my M591 Sako, on which I wanted to mount a Harris Bipod. Also had to be Left Hand so the Predator was one of the few options here and was also immediately available. I talked to a friend here who works for the Ruger importer. His advice was that they are / can be pretty rough but generally guys like how well they shoot. Got similar comments from the LGS where I ordered the rifle. When I picked mine up I really liked the weight and balance of the rifle but hated the bendy plastic stock, the "zippy" sound of the cycling bolt, the trigger with its centre blade. I bore scoped the barrel and my heart sank. I thought there is no way such a rough barrel will shoot and I couldn't believe Ruger gave this barrel a QC pass.
But, happily, my handloads proved the barrel and rifle are a sweet shooting unit. I found a great load in short order. I haven't shot that many rounds to date but if anything I think the rifle is shooting better with use. I guess I can forgive a lot if a rifle shoots this well. I don't really think about the stock feel or sound of the cycling bolt any more and still haven't warmed to the trigger but I think probably that's just a matter of time. I agree, it's a lot of rifle for the money and well done Ruger.

I passed on the Grendel Predator left hand and wished I didn't.
My American is an all weather stainless steel 18" 308Win. It will stack 3rds of the cheapest FMJ into 3/4" and my handloads into 1/2" groups. I was in disbelief when I saw what I was getting. My Rem 700 target rifle gets slightly better groups but cost triple the $300 price I paid years ago for the American.

I bought mine to throw on the front of my quad during deer season when the weather is nasty. The first season I had it hunting, it rained, sleeted, and snowed off and on for three days.

They are a great truck gun to have around.

I have one of the American Predator rifles in 6.5 CM, and it's quite accurate. I found if you polish the groove running the length of the bolt, in which the bolt stop rests, it smooths it up quite a bit. The middle blade on the trigger doesn't bother me, and I was surprised that after adjustment it was pretty good. My only ongoing complaint is the rotary magazines have issues with feeding on a significant percentage of these guns, mine included. I've tried a second mag, but it has similar problems. The gist is that the second round (of three in the mag) does not always pop up all the way after the first round is stripped from the magazine. I think a stronger magazine leaf spring would probably solve the problem, but don't have a clue what replacement could fit, if any. They're a good value for the $.