it depends on the specific tire, rated at 305 not all tires have the same tread widthMy Tire of choice year around where I live Is the Nitto NT05R in 305 on a stock rear rim. I drive my car hard and do some canyon style ish driving. I live in the mountains so its not all straight line.
There is zero issue I have encountered with running a 305 on a stock 10inch wheel. Not sure who thinks its unsafe but I have had no issues at all. Car makes 800 wheel.
For track use I use a 315 on a set of welds and MT ET street Rs.
Also I drive my Nittos around on 28 PSI cold.
To me Bang for buck the NT05R gets you the best grip for the money. I consistently get 8-10k street miles out of them.
In the current market They are 325$
Before covid I was finding them for about 280$
on a sedan people have reported the 305 SS to feel loose