Many years ago, in my pre-chrono days, I inherited my Dad's 30-06. I worked up some 'book' loads that were very accurate and killed elk and deer very well.

Then I bought the chrono. With the published book load, I was getting 2,550fps with a 180gr Barnes. I've increased the powder charge by about 2grs over book in order to get the speeds I'm supposed to.

So, yes to a chrono.