The wheel-gun cartridges are by far the easiest and most forgiving. Length is not as critical, as long as they're not protruding out of the front of the cylinder, you're good to go. Make an autoloader to long and may not go into full battery, make it to short and you may get a FTF. Crimping is more critical on the 9 and 40. With the 38, seat the bullet to the top of the cannelure and roll crimp them. I wish I had started on the 38.
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