I stopped reading when precision optics said .264 projectiles aren't ideal for big game lol.
I killed a nice bull with my 6.5 creedmoor. Your prc is fine. People are killing elk moose and brown bears with. 22 centerfires with extreme damage. Shoot a heavy for caliber expanding bullet that does a lot of damage and you'll kill big game.
Elk I killed attached
View attachment 928532
6.5mm bullets will kill ELK/DEER/MOOSE/BLACK BEAR and MICE cleanly at "ethical" ranges.
The OP may very well be capable of doping wind, elevation drop, mirage out to the ranges, temperatures and even the elevation he's shooting at when compared to what he sighted in at. The list goes on. Not many people can, especially under uncontrolled field conditions.
The 6.5 PRC round is very capable, it's not a laser by any means, no matter which rifle it's chambered in.
Once ranges get past 300 yards, velocity drops and gravity takes over. There are so many factors that will cause a hunt to go awry, out past that range.
I know people who continuously practice shooting 500-1000 yds under controlled conditions, who wouldn't attempt similar shots in the field.
I also know two people who shoot under all sorts of conditions, keep meticulous records from 100yds to 1000yds. Both claim they feel confident about their ability to cleanly take any game animal at anything in between. Neither of them have had the opportunity, or chose not to take it.
The OP didn't say he would take such an opportunity, but he definitely believes he's capable. Hopefully he does some real life, in the field practice before he tries to find out.
I killed an Elk Cow on a draw, with a 6.5x55 Tikka T3, loaded to 2550fps with 160grain Hornady round nose bullets.
Range was appx 125 yds and the bullet did everything it was supposed to do. Hit a rib just below the spine, expanded and took out both arteries, then went through the rib/hide on the far side and into the brush behind her. She walked about 20 meters and fell down.
A lighter bullet would have done the job just as well.
The 6.5x55 Swede takes a bit of a back seat to the 6.5prc but only because of the century plus old firearms it's been chambered in.
If a Tikka T3 chambered for the 6.5prc, without having to change anything, the 6.5x55 Swede loaded with good brass and bullets to similar pressures should be just as capable, seeing as their capacities are almost identical.
My 2550fps load, with Imr7828ssc, over CCI250 magnum primers, under 160RN bullets in Lapua cases, will not be found on any website or in loading manuals, but it's safe in my rifle.
All of the replies imploring the OP to use discretion show experience in the field. Minimalism only goes so far under such conditions.