I don't have a manual in front of me but your H4831 loads sound light; not sure about the H1000 but it also sounds light,since that is about where you should be with R22,which is a quicker powder.The rifle might not shoot till pressures are up a bit more.This is common with many cartridges,300 Win Mag included.



The 280 Remington is overbore.

The 7 Rem Mag is over bore.