First, make sure all items on the rifle are tight and proper. If the bedding is sloppy, get that sorted out first. Loose bedding is super common in massed produced factory rifles and there is no way to get consistent accuracy if thing are sloshing around.
For the Vmax, I would set the ogive to be 5 to 10 thou OFF the lands. Set once and forget about it.
Using current reload data and fireformed brass sized to fit your chamber, start at the lowest listed loads for varget. Yes, what is referred as starting loads.
Hodgdon reloading center data lists that as 23.5gr to 25gr as a compressed load depending on the bullet. Given the shorter throat, it will likely prefer being close to start loads.
Start at 23.5gr and go up in 0.2gr increments with 3rds per step. It will be real obvious where the rifle wants to shoot and I doubt it will be much over 24.5gr if not well below. If 23.5gr was the best load, don't be shy to start at 23gr and work up in 0.1gr increments.
I have just tested a new to me factory barrel with a shorter throat (ideal for my 50gr bullets). It looks like the rifle wants to be right on the start load with the 50gr speer TNTs, CCI450 and win brass. Have to confirm next time but the node looks to produce sub 1/2 MOA performance at 100yds.
I have shot many 223's and they have not been fussy BUT they all don't like hot loadings in general, unless you lengthen the throat and that creates other problems in light bullets.
Jerry