My brother just recently acquired a 300 winchester Remington Sendero in a trade. Anyway he wants to shoot long distance with this rifle at steel targets (1000 yds or more). He asked what he could do to make it more "accurate" or "accurize it". Now he assumes that because I retired from the Army I am an expert on every firearm there is.

I simply told him I don't know, but maybe practice,practice,practice, and more practice wouldn't hurt. Or he could spend $1000 buck on a new stock like Manners, AIC, etc.

Would like your opinion on this. As I understand this rifles are pretty darn accurate out of the box.

find a load with a good high BC bullet that the rifle likes, learn ballistics and the methods required to hit at 1000 yards, and as you said practice.
RR

The Sendero and the Sendero II are fantastic incarnations of the 700. Only factory 700 that I would spend money on these days, that and the VSSF II (discontinued now as well).

To your point, a lot of time laying on that rifle is more important than anything else.

Beyond that...

Find a bullet and load it likes, get a proper front rest and bag to shoot from, or get used to a dirty belly.

If it has the X-trigger, tune it down to a comfortable "if I go any lower, it's scary" level for his finger. If it doesn't have an X-trigger, or you can't get there for his finger with the X-trigger, or if this will be a bench rifle with little-to-no hunting time, spend the money, drop a Jewell in it. You can have a trigger job done, but the Jewell will make you happier.

Get a good one piece mount, lap the rings, and saddle a good glass on top of it so he can SEE WHAT HE IS SHOOTING AT over those ranges. The 8-32x56mm Nightforce BR is a fantastic glass for the price, even knowing the price is high. Leupold VX-3 LRT's are a great 'affordable' option.

I hate full length bedding blocks other than to keep the stock stiff. Never seen a Sendero that wasn't properly floated, but I'd still go ahead and throw some glass around it, and make sure it's floating like it should.

But ultimately, with the right load(s), that rifle will shoot better than most guys are capable of achieving, right out of the box.

Thanks guys.

its not really that diffacult, I got really serious about it in 1996, have taken I think 56 deer beyond 400, of those 20 couple were beyond 700 yards, a dozen beyond 800, a handful beyond 1000, and a couple beyond 1200 yards, but you need an accurate rifle paired with a shooting system to get it done.
the rifle puts the bullet where it needs to go, you and the system steers it. here is what I carry to the field to make hits possible at up to 3/4's mile

RR

Lots of practice, learn to dope wind and patient handloading with a heavy high bc bullet. 300 will do all you ask, and more. Shot one for over 20 years regularly. The 300 rocks.