I just read your post and for me not so important the velocity up or under 2500f/s i want to shoot as accurate as possible if that is staing under 1900f/s so no problem.
I would like to know is how fast a lead alloy cast bullet can go just so i know, when the leading starts
As Bud said, Monotype or other hard alloys are needed for jacketed bullet velocities.
However, most leading is from imperfect bullet fit in throat and soft alloys are
more likely than hard to make up for poor fit by upsetting on ignition and sealing
bore. In other words,hard may lead worse than soft.
For under 1.900 fps. linotype or #2 should work with most powders. Even softer
alloys down to 25:1 may work best at slow end of range (that is what I am currently
using in matches and 5.5 gr.TiteGroup with good accuracy.)
Better to lub or powder paint cast bullets?
We don't know how to powder coat for consistent top accuracy yet.
Would like to know what is the best alloy mix for speeds up to 1900f/s
I would try your #2 first.
And the second priorety is powder, now i have Vihtavuori N135, Lovex D036, Lovex D073.4, some Ramshot TAC, and 1pound of Titegroup at
home Ramshot and titegroup ar very hard to find here restrictions i don't know al the dealer stop importing
My experience with the 70 grain bullet in 223 for low end of 1.400 -1.900 fps range I have had good luck with fast burn powders like 700x, TiteGroup, etc. 5 to 7 grains (start at low end). For the upper end of that range 6 to 9 grains of the somewhat slower Blue Dot, 5744, 4227, etc. [ according to the table of burn rated by LHS Germany similar burn rates of Lovex powders would be DO32 or SO30 for TiteGroup group and DO37.2, SO40,DO60 for the 5744 group]
Always start at low end of recommended range and work up.
The Lovex, VVn135, and Ramshot powers you now have would be better used when you start trying for jacketed bullet speeds.
Sorry for the funky format.