I use the 200 gamekings in my 300wm and the 180 game king in my '06. Both work very well. I used the pro hunter 150 in my '06 before and they are good also. My garand loves them. I only had one complaint on my 200gr Gameking loadings. I loaded some for a friend and he said he busted a white tail at 200 with his 300wm and it was a heart shot. He said the deer immediately broke and ran 100yds like it had never been hit. He said the blood trail was good but didnt like it that the deer didnt fall in it tracks. I felt like it did its job but he didnt. I prefer the 200gamekings due to a BC of.530, if i remember correctly,but most of my shots it wouldnt matter anyway. As far as construction i cant tell you but performance on white tails the 180 and 200 gamekings and the 150 pro hunters are great. I have had great accuracy with all of them but the 150gr pro hunter with 50gr IMR4895 from my garand were the most accurate out to about 200 yds.
