its been a while so im a bit rusty on my laws, but with a private rifle sale, is the seller allowed to transport the rifle to the buyers house? ive done wuite a bit of selling and the buyer would always come to me.

Assuming you have an FID, yes. I can't remember if you didn't if it would be covered under the exemptions.

A long rifle can be transported anywhere as long as it is in a "secure package".  That can be from a locked gun case to wrapped and tied in a package.

Only if the owner was issued a FPID.