thank you both for the suggestions i am from north dakota and hunted the badlands with a rifle for my first time this year i normally hunt local took 6 years to draw the tag i currently shoot a factory 270 wsm kimber brand with 130 grain ballistic tip ammo the last weekend of deer season i ranged a large mule deer at 680 everything was always 500 plus and i kept passing them up i knew this may be my last chance i took the shot 1st shot i put 3 feet above the back missed but seen snow blow up behind back knew i was close second shot miss third shot two feet above back and i spined him instant kill i was in disbelief i got him but i was very happy ...but for future hunting i want to be able to make a shot like that without guessing and with accuracy and no chance of leaving an animal wounded
The main ingredient to long range success is lots and lots of practice and the proper gear.
Let me make this suggestion. Pick up a quality .260 or 6.5CM and practice every chance you get from 400-800yds in varying conditions and varying ranges and become proficient with it.
Haver yourself another like the .300wm suggested above and save it for hunting season.
The cost savings with the cheaper/smaller caliber ammo will pay for the second rifle in a year or two depending how much practice time you can put in.
Of course you'll need to shoot the big gun enough to verify your zero, drops, wind corrections etc but you can do that with an average of about fifty rounds a year or less.
I will do 90's of my shooting with the 6.5's but generally have one of the STW's and maybe one of the .300's with me all the time as well once hunting season opens up.
If you do go the route of the .260 or 6.5CM take a long hard look at the Prime Ammunition offerings in .260 and 6.5CM. I have shot 2,000-3,000 rounds of it in .260 and many thousands of rounds in .40 and .45acp and they put out the most accurate and consistent factory ammo I've ever shot.
https://www.primeammo.com/ammunition.html
At their prices when it comes to high volume shooting you can't beat it. If you order a 1,000 rounds or more at a time they'll even give you a break on shipping. I generally order 2,000-3000rds at a time and get free shipping.