Hello
I think that for them hp300 / 60 to color have the same technology as stancannon CL-38-41-51 COLOR:PLUS OF 1120 NOZZLE while hp (black 300/60) has practically the same thing(matter) as (cannon) PG37-40-50 (320 nozzle)

I think that HP copies many standard(cannon) we have already seen him(it) with them hp364 / 564 who looks like in standard(cannon) pgi-5 cli-8

and now hp300 / 60 to color present even problems that standard(cannon) cl-38-41-51 why a hp 350 in more than 600 nozzle and now hp made cartridges has punishment(effort) of 320 nozzle???