Myself and several friends ( on four trips from '96-2002) used the 300WM ( I used other calibers too, but sometimes borrowed my friends 300WM) we all used the older Barnes 180 XBT handloaded just shy of 3100fps. The TTSX is even better now ( as far as accuracy goes) We killed zebra, blue wildebeest, red hartebeest, wart hog, impala, Blesbuk, the big Namibian Gemsbuck, Springbok near and far. It was pure poison! So, get you some Barnes Vortex 180 TTSX factory ammo and get after it!
BTW, I also recently bought a CA Mesa 300WM and I have several good loads, my main one being the 150 TTSX. The last bullet I worked up a load for was the Nosler 200PT. It shot them great. I don't know how long that 200 Edge TLR is, but just "maybe" your rifle doesn't like that "specific factory load"? At any rate, 1.5" is way plenty for Plains Game and many others! Have a ball though!
