Hoytaddict,
I'm currently working on a longrange load for my 7STW and it also has a 1-9" Twist bbl as well. I have decided to load the 180g Barger VLDs as well. I just seemed right to try to shoot the heaviest bullets available. I plan on hunting Muleys and Elk with mine and 1000 shots are certainly possible where I hunt. Retained energy at longer distances trump a Lazer Beam trajectory any day in my book.
That being said, I have taken Deer and Elk with Berger Bullets, however, my shots have all been over the 300yd mark, using a 168g VLD out of a .30-06 AI at 3100FPS. I took a Cow Elk at 365yds and my father used my rifle to take a Cow Elk at 525yds. They performed perfectly, with only one pass though. My Cow was dead on her feet but going down hill to the wrong part of the country and I hit her a second time and took off the top of her heart and the bullet passed completely trough. She fell where I hit her.
Interestingly enough, as I'm loading the 180g Bergers for my 7STW, I've had to turn my rifle into a single shot and load them out to the lands and this makes the COAL too long for the magazine. I decided to install a single shot follower to keep it from binding.
I've included this photo showing how long these have to be in my rifle. So far they will group under an inch at 100yds, but I'm working on improving velocity while retaining accuracy. I also need to put a new stock on this rifle and after that, I'll resume load development. No need to waste ammo if the loads need to change.
( For comparison purposes only, Left to right cartridges are 7STW (180g Berger VLD), .30-06 AI (168g Berger VLD), 6.5-06 AI (129g Hornady SST), .243 AI (100g Sierra Gameking), and .243 Win (75g Sierra HP)
Hope this helps,
Dan