What calibre is your gun. I have a gun built on a tikka action and spent a year looking for after market tikka mags, or high cap mags.
My gun was a 300 WSM and 3 was the best I could find. Thats why I spent several hundred dollars going to an AICS bottom metal system, similar to the one shown above.
an AICS 10 rd 308 mag will hold 8 rds of .300wsm. Just need to bend the lips of the mag slight to allow for the fatter cartridge.