Without a chronograph, you will only be guessing as to what a max/safe load is in your rifle.
I would stick to published data, by all means, work up to the max listed charge of 69.3gr if none of the signs mentioned below are observed.
Reading primer appearance is not a valid indicator of pressure, I discovered this very quickly after buying a pressure measuring device!
Sticky bolt lift, blown primers and ejector marks are all signs that a load is WAY over max.
I used to load up until I got loose primer pockets and then dropped the charge by 2-3gr's in large cases (30-06 and larger), or 1-2gr's in smaller cases.
I now realise that some of these loads were way over max pressure, even though the velocity was 'trackable' and still within published data.