Welcome.Nothing wrong with the 17m2.Great caliber,but the gun would have to be very cheap to consider a caliber change.I would imagine that it would be a minimum of 500 from Cooper.Barrel and labor.Everything else remains the same.(and the only possible change,is to 22lr.No other choice)
Buy a gun in the caliber that you want.

 

So,the mach-2 is a necked down .22.It's not possible to go to a .17 HMR

 

No,you can't make it a 17 hmr.(Well,possibly,but double the 500 number.Different magazine,bolt travel,receiver port size,etc.etc.)
Yes,a m2 is a necked down .22lr.

 

While 17m2 ammo is difficult to find, it's not impossible. But you could call Cooper and ask what a rebarrel would cost. I think you'd be best served by keeping it in 17m2

 

thanks for the responses,i think I'll keep looking.

 

What caliber are you looking for?

 

If you plan on target shooting don't buy the gun. If hunting is your preference I think the 17 Mach 2 is the best squirrel hunting caliber out there. I did an expensive conversion on a 10-22 years ago to the 17 Mach 2 not understanding some of the issues with the caliber. But after shooting it some I'm glad I did. In a Cooper it should be awesome. It is a terror as far as rimfires go. Get 5 or 6 bricks and use it to hunt with. Ammo is out there I've seen it for 100 a brick this year.

 

Like 'sicumj' said, the Mach 2 is the best squirrel rifle out there and it is an excellent short range prairie dog rifle too. So, I would keep it, if I were you. I was looking for a Cooper when I found my Anschitz 1502. Still searching for a Cooper 17 HMR. Would love to see a picture of your gun.

 

If you are sure the rifle is a bargain buy it resale it and put the profit toward the rifle you want.
I have a 57 in M2 and it shoots like a laser.



Greg

 

Lol. Got exited when I seen a post for Cooper in HM2. Then looked at original post was almost 9 years ago.