I assume you mean you have bullets that are sized for .357 Magnum. Their nominal diameter would be .357 for jacketed bullets and .358 if they are cast. Yes, they can also be used to load .38 Special. Barrels chambered for either round typically have a .357 groove diameter, although some, such as the Colt Python, are a bit tighter.
At this point, it should be obvious that .38 Special is actually a .35 caliber cartridge. Back in the black powder days they did things differently.
What you shouldn't use those bullets for is to load "38 caliber" cartridges that are actually 9 millimeter. This would include .380 ACP and .38 Super. They need a .355 (jacketed) or .356 (cast) bullet. Doing so could result in dangerously high chamber pressure.
Any reloading manual will tell you exactly which bullets will work with which cartridge. I recommend the Lyman manual.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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