You can always email Sierra. That is what I have done for a couple calibers I have where little to no data was available such as 26 Nosler and 223 WSSM. Their customer service has been very quick in getting back to me even when they had no data and sent me non-Sierra data for the 223 WSSM. It is worth a shot. Good Luck.
I sent them one yesterday, Thanks. I did check my magazine length it max's out at 3.310. That is alot of bullet jambed down in the case. I will try a few when I get more data. The Gamechanger is a long bullet.