I have a bit of a TRG addiction. My love affair started around 2011 with a TRG in 260 Rem with a 26 inch barrel. Like your 6.5CM, it was accurate and a real pleasure to shoot.
A video I made of my 260 TRG back in the day.
About a year later, I was wanting a shorter 308 to use as a hunting and trainer rifle. My wife surprised me with a 308 TRG 22 with 20 inch barrel for our 10th anniversary! It was much more pleasant to handle in the woods suppressed.The 308 TRG really liked the Hornady 178 BTHPs for target. I also developed a nice load pushing 200 Sierra Gamekings at 2575 for hunting use.
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Fast forward to 2022, I found a great deal on a TRG 42 in 338 LM. I picked it up around 3 months ago for a song as my first ELR rig. I have already put around 500 rounds through it. It is a hammer with 300 SMKs and 300 A-tips! About a month ago, I got my first hits at a mile and 2011 yards with it. It is just a great gun for long range. I have a Terminator brake for it and find it comfortable to shoot about 80 rounds in a session.
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I have added a Vision aluminum handguard with a built-in Arca rail to my 338. To this I can add an ADM two pound weight for recoil mitigation and my Atlas bipod. To the rear, I added a KRG folding stock. It is a very nice rig and looks visually different from my other TRGs. I still need to paint it.
So definitely keep the TRG 22 and buy the TRG 42!
Unless you can’t shoot longer than 1000 yards, then I would probably just keep the 6.5.