The factory numbers are from a 24" test barrel and pretty much no one ever actually gets the numbers any of the factories state for their .30-30 ammo. In reality darn few factory loads in any caliber deliver what is promised of them in our rifles. Hornady Light Magnum ammo is an exception and unless your barrel is significantly shorter than their test barrel you will get what is promised and at times more.
One other I've noticed exceeding factory promises is Remington 7-08 140 grain core loct data. It has matched factory numbers for me in 15" Encore barrels even.