Has it not rained where you are? Everything is soft here. I’ve drilled 2 pasture fields this year for 2 separate people with weaving gd. One is up but getting a hard time with flee beetle and other is just emerging. There’s not much pasture land that is that hard because it’s got such a mass of fibrous roots
for that drill.... reasonably dry is ok but still needs good conditions bit of 'workable soil' for want of a better way to put it, that will fall out of the side of the disc slot and settle around the seed, he wont want it to be too sticky or wet though . especially if it dries out after wards.
but having said that Well Its cheap enough seed (?), ....,just go for it.
If it’s very dry and a close spaced drill penetration is a real issue in old grassland, the discs can just run on top of the old turf. We often have to pull out and go back after some rain since moving to a close spaced drill.