Hodgdon data for a different 55
55 GR. SPR SP Hodgdon H335 .224" 2.200" 23 3018 40,800 CUP 25.3 3203 49,300 CUP
Start 23, Max 25.3
Lyman 50 Data
Sierra SPT 55gr H335
Start 24.3 3142 fps Pressure 35,200 CUP MAX 27.0 3270fps Pressure 49,100 CUP
27gr is a MAX load according to Lyman and you would need to work up to it slowly if you wanted to use Lyman's data.(which is for a different bullet)
Different bullets will give different pressures, different brass, different rifle = different pressures.
What is a safe MAX load with one type of combo might be unsafe with a different type of combo. (bullet, brass, chamber, barrel, OAl etc)
Note that the Hodgdon data shows 3203fps with 25.3gr and the bullet they used, Lyman shows 3270fps with 27gr (MAX loads) and the bullet they used. 1.7gr more powder could easily get you into an excessive pressure area.
You didn't mention the rifle you were using.
5.56 is allowed to run higher pressures than .223, but note for example Sierra shows lower charge weights for Semi Autos than for bolt guns.
http://accurateshooter.net/Downloads/sierra223rembolt.pdf 23 to 27.5gr H335 with a 55gr bullet.
http://accurateshooter.net/Downloads/sierra223ar.pdf ----23.6 to 25.7gr H335 with a 55gr bullet
If you are using Noslers makes sense to use their data.
So if
you feel you really need more velocity you could start working up say maybe .2gr at a time from 25. I wouldn't go higher than 25.5 and that might be to high for your combo.
I am shooting Semi autos so if it was me I wouldn't consider going higher than 25.5 with any 55 and would work up to that.
Depending on the bullet (55gr) I found about 24.7 gr of H335 shot well for me. (need to check my notes but as I recall I stopped at a bit over 25gr)
You didn't mention if you worked up to 25 or just started there.
If you didn't work up and check accuracy I would start over at say maybe 23.5 then go 23.8, 24.1, 24.4, 24.7 25, 25.3 and see what shoots the best.
I would trade 50-100fps for a more accurate load all the time, paper won't know the difference, and even hunting 50-100fps won't make that much difference. (unless game is at long distance and you are on the edge of what it takes to make the bullet expand, in which case you need a larger caliber anyway)