I have been considering getting a Tikka Left Hand Bolt in 270. I have looked at them in a couple gun stores. How many grades do they come in. Is there more that one model in the LH bolts? To those who have them, how do they compare for accuracy with other rifles you have had. With my bad shoulder, the 270 is about all the recoil that I can handle. Also considering a new Remington pump as my right arm is good and I can work a pump reak well. Any thoughts.