Thanks johnnyk;your info was very helpfuland thanks for the warm welcome,i've been loading for only a little while and mainly use Nosler and Hornady Bullets and just needed a little help with the sierra's again thanks for your help.Hey man, welcome to LongRangeHunting. Good choice of caliber, bullet and bullet weight. I have never used the GK but have shot a boat load of the 150gn Nosler Ballistic Tips through the two 7Mags that I owned.
My Remington Sendero liked the 150gn pushed by 67gn of RL22 and CCI's BR2 primers. My 700P liked the 150gn NBT pushed by 63.5gn of IMR4350 and Remington 9.5M primers. Both these loads gave me sub 1/2" groups and have been the demise of many a creature.
Check out reloadersnest.com, accuratepowder.com, alliantpowder.com, hodgdon.com and ramshot.com. All these are loaded under my favorites for quick ref. Good to have so you don't have to buy all the reloading manuals.
Hope this helps in your endeavors and again, welcome. JohnnyK.