HS without a doubt. I’ve had their rifles and I’ve built a few with their barrels and they are really really good barrels. Cooper makes a nice gun but I can’t say enough good about H.S.. I don’t know why more people don’t use their barrels they are pricey but good.
Ive got a 300wm HS and a 7/08 Cooper. I hunt with the Cooper way more, but that's just because its smaller and just fits me. The 300wm HS Precision is a laser beam and just impressive in all respects. This is practically a Chevy-v- Ford issue.
My Cooper barrel is a 'slow' barrel. However, I have no qualms pushing the loads. The HS Precision is freaky in that it shoots everything pretty good.
Ive had both and I prefer cooper rifles over the HS rifles. I sold both my hs rifles and kept my coopers, Both rifles from both manufacturers were superbly accurate, but my HS PHL in 300WSM had feeding issues which is unacceptable for a rifle in its price range, when I called HS precision for a solution to the problem their answer was I should single feed it. Not an acceptable cure to a feeding Issue in a hunting rifle. My other one was a PHR in 300 RUM and I have zero complaints about that rifle. I feel the fit and finish is better on both my coopers and both are extremely accurate rifles, I find the coopers fit me better then the hs rifles. I will personally be sticking with my coopers over Hs precision.