Re: 7mm 150 gr. gameking
Not in the grain weight your asking about....but
I've been playing with Sierra's 7 MM 160 gr spitzer boat tail gamekings (1920) out of a model 70, just for paper (F class) and I can not get them to work, they fly all over the place (I've cut some through with the lathe and it seems the lead core is not concentric towards the front of the bullet). I had better results with Speer's 160 gr boat tail (1634) I haven't had the time to prove how much better. just to see the difference I loaded 5, 175 gr hpbt match (1975) Sierra's about .005 off the lands and at the max of published data and I was suprised with the accuracy. I was attempting to make a silk purse out of a pigs ear with the game kings.
I apologize in advance if this not an appropriate response in your thread.
"to remember that all worlds draw to an end and that noble death is a treasure which no one is too poor to buy" The Last Battle - The Chronicles of Narnia - C. S. Lewis