curious about your barrel rework
any pics of the process?
Is the aim to reate contact between fore end and the barrel?
Yeah I took a pic. Please see the 2nd pic below. The two darker spots - were already there by manufacturer. You can choose to remove those if you wish and put your own fresh putty in. I left them 'as is' as reference points.
1. Cut a 1x4" stripe out of fruit plastic package. Or source any other a similar piece of plastic sheet. It must not be too rigid, not too soft either. You will need this stripe to
ensure a gap in between your barrel and the front of forend. It must be 0.3 ... 0.5mm thick, which is perfect as a gap.
2. Read instruction of your epoxy putty.
Once having kneed it, mine has only 3 min cure time - I bought it at Canac:
https://www.canac.ca/en/pc-plumbing-epoxy-putty-2-oz-5130003
So cut off, mix and kneed enough amount of putty. Do it quickly then form and put it down the forend cavity -- see the pic below:

You also need to put about
1mm layer of putty inside the anchoring pit. OR stick a 1mm thick petal of putty right to the bottom surface of the anchor instead.
3. Quick assemble, put it all together: insert that 1x4" plastic stripe in between the barrel and forend at front.
Screw in the anchoring bolt as much deep as you need. Remember the 1mm putty petal?.. It works as a regulator. So do not tight it up too much. At the end turn the bolt by small increments and observe your barrel to get seated properly. Remember, the putty is still soft, so make just enough effort to make sure your barrel is properly seated and aligned inside the forend.
There must be no any significant amount of torque applied anywhere to the forend. Put the assembly aside for 24 hours, let putty cure up. Next day when putty is stiff cured you can tight the anchoring bolt up a little bit, but not too much, maybe 1/4 turn maximum. Insert a $5 note in between the barrel and forend to check the gap. It must go through with no friction. Inspect the gap all the way until the front putty pad.
4. Do not put the barrel band back on. Your job is done. Go test shoot your rifle and let us know your groups.
p.s. If any reason the result of your 1st attempt doesn't look satisfying - unscrew the bolt, clean things up then do it all over again.
In reality it is not a too complicated process. It took me only about 15..20 minutes and worked from the 1st attempt.