I had to use the help of my chronograph to tell me when I should quit even if I didn't see pressure signs with some powders.Most of the time I'd be getting a tight bolt lift a few grains below reaching book max.There was no way I could load book max loads in my rifle.After fire lapping,I knew the velocity of my loads,the velocity dropped about a 100fps.I was starting to get a little erosion on my throat so it not only cleaned that up a little,it also gave me a little freebore that my rifle never had that was why loads listed in the manuals where always too hot for my rifle.180gr data max loads were about perfect max for my 165gr loads.Now I'm sure the 165gr data will now work for 165gr bullets in my rifle.

~Molɔ̀ːn Labé Skýla~
As Bob Hagel would say"You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong."Good words of wisdom...............