I'm not sure what has changed with the SGK's but something certainly seems to have.
I used to shoot quite a few of them in .220 Swift, .243win, and 25-06 and had good luck with them.
Two or three years back I ran out of Hornady Interbonds and with the season closing in bought some SGK's locally for the .300wm and 7mm STW. About halfway through the season with a half dozen deer and twice that many hogs down I swore off of them permanently because in every single case the bullets broke up giving completely unpredictable terminal performance.
One particular shot really bothered me, it was on a large buck shot quartering to me, the bullet broke up and left a gaping hole as long as my elbow to fist six inches wide along the opposite side rib/backstrap area. Kind of made me sick. I think Mario probably still has the picture I sent him of it. Barring a collapse of society and zombie invasion that was the last SGK I'll fire.
If you want to stick to lead core bullets I'd suggest Hornady Interbond if you can find them or Nosler Accubond.
The Nosler Partition was developed specifically for Moose, Elk, and Bear. The only problem with then can be minimal expansion if you don't hit stout bones.
I've gone almost exclusively to the Peregrine VRG3 and 4 and the VLR's
Over the last three year's I've shot them in everything from the .260's to the .375 Ruger at ranges sub 100yds to over 740yds on over 50+ Game Animals from Africa to Texas and the terminal performance just can't be beat.
Expansion is consistent at 1.5-2.5x bullet diameter and even on full length shots on big animals just above the sternum out the south end I have yet to recover a bullet from an animal.
I never thought I'd willingly turn to monometal bullets but they have me pretty well hooked.
Load data for the Peregrines is somewhat limited but you can use data for TTSX or LRX Barnes for starter loads on similar weight bullets.