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There are a number of new powders and for sure new bullets come out in the last few years.
Yes you can fill in, I like to keep at least one current manual and I prefer Hornady or Sierra (which is pretty dated now)
As Hornady came out with a newer one first, its the one I will go with.
The 9th edition will sit at the computer with me as the subject comes up on loads often and along with a couple other ones it gives me a reference without going to the other end of the house.
I keep a real old one in the shop for cross reverence (Honrady and a Lymans).
As for the powder companies, I look at their data but I do run up past mid range loads fairly often if just testing and a bullet mfg for a specific bullet is safe. You can figure some of those listing multiple bullets with the same loads are under loaded, but safe is good.
You can always nudge higher carefully particularly if other sources with similar bullets say so and or the powder generic bullet.
Keep in mind, when you are up around max, a miner change like a primer mfg of a bullet that looks the same and same weight but is a different mfg can push you over the safe edge.
The powder mfgs don't' give you case, primer or gun their tests are fired in.
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