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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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