RE: 25-06 corlokts
I have used the 25-06 for 29 years. I have loaded just about everything out there. Most of the bullets are pretty accurate. But the key to the accuracy is to NOT load them to the max. Back them down 200 to 300 FPS and you will have a great deal more success. I have used the Remington Corelokts and they are OK. The Nosler Ballistic Tips are dynamite on thin skinned game - deer, antelope. If you are using it on larger game like elk, you need to use the partition bullet so that you get deep penetration. Also, since the 25-06 is a just a little light for elk, shot placement is critical.
Of all the ammo I've used, the Winchester Western PP is the most accurate. However, you can't buy the bullets from Winchester; they are proprietary and WW won't sell them as components.
Remember, slow your loads down and you will have a great deal better accuracy.
Good luck,
SD Shooter