Buck's point brings you to the only reason that exists for trimming low pressure handgun ammunition. It doesn't grow like rifle cases because the pressure doesn't stick the brass to the chamber walls (just starts to happen at a little over 30,000 psi peak values, with some variation for powder type). But getting even crimps without adjusting a conventional crimp die does benefit from uniform trimming.
If the flare issue persists, get either a Lyman M die or, if you need a powder-through die, the Lyman Multi-expander (which comes with inserts for all common handgun calibers). These dies put a small step in the case mouth just below the belling of the flare that the bullet sets squarely into. This not only minimizes the amount of flare required (increasing brass life) but when you examine the slight bulge in the finished cartridge's case over top of the bottom edge of the seated bullet's base, you will find these more even all around the case because the bullet was started in straight and couldn't cock over to an angle during seating. This works with jacketed bullets, too, btw, and for this reason the Lyman M dies for rifle cartridges are seeing increased use by people loading precision rifle ammunition for that reason, even though mouth expanding is not historically done with jacketed rifle bullets. Using an M die and an RCBS standard seating die will get you very concentric rifle rounds as long as the case neck wasn't tilted by pulling too hard over a sizing die expander.
The other thing you can do to get around trimming is to use a
Lee Collet Style crimp die for .38 Special. These apply a compressed ring crimp rather than a roll crimp or a taper crimp, same as you see on some military and commercial rifle ammunition. The die can actually form its own crimp groove into a bullet that doesn't have one. Since the crimp is applied from around the outside of the case mouth and not by pressing on the end of the mouth, the exact length of the case is not as critical as with a roll or taper crimp.
Note that despite being less length-critical, the collet type crimp dies do have a limit to the range of case lengths they can work with, so they are different for .38 Special and .357 Magnum. It's a one-cartridge die design.
Posting photos is really no harder here than anywhere else. I recommend you resize (lots of free software on line for this) a copy of the image so it is not more than about 800 pixels on its longest side. This keeps it from going off-screen. That will be needed regardless of what hosting site you use. Then I recommend you host it on this site. That's the only way to be sure no change in your host site's policy will ever remove it, as happened with Photobucket. To do this, at the bottom right of the quick reply window, click on the Go Advanced button. In the advanced composition page, scroll down (if you need to) until you see the Manage Attachments button under the line below the composition window area. Click on that and a little window pops up with three Browse buttons. Click on one to browse to your photo and select it. When the file name and location appear after the button, click the Upload button. A blue link will appear below the Browse buttons. You can right-click on that and select to copy the link and then click on the postcard icon at the top of the composition window and paste the link in to have the image appear in your post as well as having a linked thumbnail at the bottom. Or, you can stop there and close the Manage Attachments pop-up window and just have the linked thumbnail appear at the bottom of your page. When you count them out, these are the same number of steps you have to go through with any hosting site, sizing the image, uploading it to the host site, copying the link from the host site and then pasting it in between image tags in the post.
BTW, that postcard icon just puts the tags in for you. You can also type them in manually if you prefer. Just type [IMG] before the link to the hosted photo, and then [/IMG] afterward to close the image tag.
Also, if you try to upload the same image for use in another post, the system will recognize that it already has the photo and will tell you, giving you a link to the thread it appears in. If that happens, then right-click and tell it to open that link in another tab so your composition isn't lost. Then scroll down in the new tab and select pages, if needed, until you find your post the photo originally appeared in. Right-click on the link thumbnail at the bottom of the post, close the tab and paste that link into your new post between image tags and the image will then appear in both posts.
