im trying to make my 270 win as accurate as possible i read alot of people saying that neck sizing improves there accuracy.what do you all think is better?

The best match shooters FL size and the benchrest shooters neck size. As far as your rifle goes one would have to try it each way. What's unknown is if the chamber is even lined up with the bore?

In general function trumps groups and a FL case is more reliable.

I FL almost everything. Too many guns to keep track of otherwise.

I agree with Savage 99...I full length resize all my hunting gun ammo, as feed and function takes precident over accuracy...I neck size my varmint and target loads...

As a matter of fact, in all my present hunting rifles, I can't tell any difference in accuracy between neck sizing and full length. probably get a little less case life with full length resizing, but I don't use old brass to hunt with so its a moot question here.