Originally Posted by Long Time Long Ranger
Also many just don't like cutting the extractor groove in the barrel for the winchesters which means a gunsmith has to do it and the average guy can not rebarrel. several factors.
Everybody above is correct, and Long Time Long Ranger touches on the bigger picture that Winchester Actions are an all around complicated action to manufacture, inlet into a stock, install a barrel, etc. The good Ol' Rem700 starts out as a bar of steel and is elegantly simple. Along with the extractor groove as mentioned on the M70, just go look at a M70 action (out of the stock) and you will see that it's an odd shape given its function, especially how the magazine box integrates into the action.
With that said I've got a winchester M70 short action wsm and it's a shooter for sure. So it can be done, but definitely takes more effort. And the short action win70 is a bit l longer and I'm able to seat my bullets a touch longer than 3" and get my bullets right up to the lands. I don't believe you can do that with a remington short action. But I will admit that when I started out building my win70 wsm, the goal was a light rifle that fed bullets well to hunt elk and bears in thick timber... and the claw extractor does just that. I did not have the goal of it being a long range rifle... I guess I just got lucky and now it's my favorite gun. I don't think I would ever build target gun based on a winchester action.
So although not as popular for long range rifles, there are a few of us here that have very accurate rifles built on winchester actions.
Side note: after some recent experience helping a friend with his winchester that was having some warranty type manufacturing issues, winchester's customer service was downright horrible. Never had a worse experience and was flat out lied to over the phone by more than one customer service agent. Based on that I don't think I'll ever give my money to winchester again unless there is some kind of massive turnaround with the company... and not holding my breath...