"Not to disagree with anyone but I was under the impression the 357 Magnum was designed around a 140 lead bullet"
Well... no. As originally conceived by Keith, Sharpe, and others, the .357 wasn't targeted at police but at sport shooters, such as hunters. Sharpe especially was interested in the sporting aspect.
As such, they tended towards heavier bullets, not lighter ones, and virtually all of the ammo manufacturers that loaded the round before WW II did so in 158-gr. loads.
It looks like Peters started carrying the .357 in the 1938-1939 range. The 1939 catalog shows 1 load -- 158-gr. lead bullet.
Remington also appears to have added the round in the same time frame and their 1938 catalog shows 1 loading... 158-gr.
Winchester introduced the round to market in 1934 or so, but I can't find any of their catalogs from that time frame to tell me exactly what loads they offered.
However, this page shows a VERY early box of Winchester .357 ammo, likely from 1934 or 1935, and it's loaded with 158-gr. lead bullets.
http://smith-wessonforum.com/s-w-hand-ejectors-1896-1961/76430-early-357-ammo.html
Other weight loadings MAY have been available early on from Winchester, but if anything, I'm sure that they would have been heavier loads suitable for hunting.
It wasn't until after WW II that lighter, high velocity loadings became available, targeted primarily at the police market and with metal piercing bullets.
"the "standard" police load for the 38 Special was a 200 gr. RN??"
No, it wasn't the "standard" police load. It was called the police load (in various names) and was brought out for police, but as originally developed by S&W and UMC in the late 1890s, the .38 Special was loaded with a 158-gr. bullet.
To the best of my knowledge, the 200-gr. police loading was first offered in the 1920s.