If i'm on the border, I have used "4.1/4.2" and have also used "4.15" to denote the conundrum you are experiencing. In my head 4.15 means it is splitting the difference between 4.1 and 4.2.
Regarding generic labeling I have some boxes that only have a bullet and powder charge listed i.e "H&G 68 4.3 BE" means 45 ACP with a 200 grain H&G 68 SWC with 4.3 grains of Bullseye with an OAL around 1.24 and some type of LPP. On rifle loads I get more specific but for blasting ammo i'm never going to look back and wonder what type of primer was used.
Regarding generic labeling I have some boxes that only have a bullet and powder charge listed i.e "H&G 68 4.3 BE" means 45 ACP with a 200 grain H&G 68 SWC with 4.3 grains of Bullseye with an OAL around 1.24 and some type of LPP. On rifle loads I get more specific but for blasting ammo i'm never going to look back and wonder what type of primer was used.