I have the Sinclare and I turn necks on several Factory chambered guns and 3 custom Chambered ones. The only good thing about neck turning is you only have to do it once. It will improve accuracy some but you need to make sure you have done a lot of other things prior to starting neck turning. True Accuracy is a very shy animal. There are a lot of tricks out there that will get you close to him but they all have to work together to make it happen. The key is consistency shot after shot after shot.
#500 for me