If it is similar to 6x45/6TCU, you are not going to get enough speed for expansion with the heavies.
I can put you in contact with a fellow in Shiner Texas that has more knowledge than anyone I know of with this type speed and cartridge. He has shot a lot of hogs and deer and done some pretty extensive work with different bullets. If your bound and determined to run a heavy I will guess he points you towards a
Nosler ballistic tip.
PM if you want to email him.
I used a 6TCU carbine about 25 years or so ago. I still used the Sierra single shot pistol bullet and kept my shots at 200 and under. It worked but lacked some horse power in my opinion.
Jeff
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