The length of the bullet dictates required twist rate and because copper weighs less than lead, same caliber bullets of the same weight, the copper bullet will be longer thus possibly requiring a faster twist to stabilize.
What are you going to finish it with? We have a live edge counter that was finish with a bar top gloss epoxy. The brand was System One or something like that. Looks like Wisebond has a gloss bar top epoxy, self leveling and same brand so shouldn't react adverse with what you have. After it...
Barnes Vor-Tx 6.5 CM 120, or the 6.5 PRC 127 LRX for factory fodder or the 6CM with 95 LRX, whatever is more available in your area. My 6.5 PRC Win 70 with 22" Benchmark shoots the 127LRX at 3200 with RL-25.
Get a Ruger American Gen 2 in 6.5 CM, 7-08 or .308 and put a Trijicon Huron 3x9 from Eurooptic for total of under $1000 and get the balance in ammo and go shoot it to get comfortable.
Yep, get mid slope if there is a slope, stay out of the washes and hunker down. Gets kind of scary at times caught in one in the Book Cliffs once and on the top of a peak in NE Wash.
Was the chamber possibly rough to start and over time has caused a build up of brass scuffed off the cases and now is causing issues? Looks like the chamber needs to be polished?
Or a target with black and white 2" squares in a checkerboard pattern. Lots of targets and patterns out there to see what works. Kind of what you have to do when you can't focus on handgun sights any longer, search for a target that is visible with aging eyes.
what kind of dot, how big of dot, what does it cover at 100 yds? Maybe something as simple as a big cross of black tape on a white piece of paper. Just so it is something that you can pick out/divide evenly to assure that you are holding at the same point each time. Much easier to install a...
Basically you have to have velocity and mass to do anything with a bullet. Velocity without mass does nothing mass without velocity does nothing, therefore you are left with the third leg of the formula, energy.