Mark,
Sorry for the late response. I had a Cowboy Match yesterday and didn't get home until late last night. CP & Ranchman have already given you some great answers to most of your questions. I'll try to give you a little additional info or maybe a different take on some items.
<font color=blue> I'm particularly interested in those carbide .223 dies.</font color=blue>
I've never used them in 223. If you were going to reload a
lot of 223, they may be worth it but understand, YOU STILL HAVE TO LUBE THE CASES. Carbide dies eliminate lubing only on straight wall cases. Bottlenecked cases, even when used with a carbide die, must still be lubed. Whether the long life of a carbide 223 die is worth the extra expense is a question you'll need to answer yourself.
<font color=blue> the Lee dies seem O.K. but all I do is straight wall cases so far</font color=blue>
Lee makes some good products and their dies work just fine for straight wall cases and non-critical bottleneck cases. For match grade ammunition in bottleneck cases or bottleneck ammo that must feed in an auto-loader (223 for AR-15), I'd suggest one of the other die makers. My personal preference for most situations are the Hornady dies. I've had extremely good luck with them.
<font color=blue> I've spent many hours drooling over the Dillon and RCBS products</font color=blue>
For heavy duty chores like case forming, you can't beat a RCBS Rockchucker press. For a small step up for all but case forming, I like the Lyman Turret press. If you ever want to move to a progressive, bite the money bullet and buy a <A target="_blank" HREF=http://dillonprecision.com/>Dillon</A>. There simply is no better progressive press out there and their "No BS warranty" is exactly what they say. I currently have two Dillon XL 650s and one RL550. One 650 is set up for 45 Colt, the other for 45 ACP. I use the 550 for most other pistol caliber reloading as I shoot the other calibers in lower volume and the 550 is a little faster to switch calibers on. I also use the 550 for reloading 223. For all other rifle loading, I use a Lyman T-Mag turret press.
<font color=blue> Do I need a tumbler?</font color=blue>
In my opinion, cleaning your brass is an essential part of the reloading process. Powder residue, dirt, grit, etc., will all build up on your cases and can lead to a malfunction. I have three of
and they have served me very well over the years. They are inexpensive and do a good job. Or just go all out and get <A target="_blank" HREF=http://dillonprecision.com/template/p.cfm?maj=16&min=0&dyn=1&CFID=1404145&CFTOKEN=78588901>one of these so you can clean your brass and attract Graboids at the same time. (If you don't know what Graboids are, rent the movie Tremors/w3tcompact/icons/smile.gif.) For cases that require lubing, I'll tumble first to clean and then after resizing I'll tumble them for about 15 minutes to remove the lube. If you do this, just make sure that after the second tumbling you check the flash holes for media. It has a nasty habit of sticking in there and plugging up the flash hole.
<font color=blue> Do I need to resize pistol cases?</font color=blue>
If you actually mean resize, yes. The only thing you can really get away without resizing (and it is actually beneficial to accuracy) is ammunition used in bolt action rifles. And even then, you need to neck size for good bullet retention. If you are talking about trimming, yes but usually only at two times. First, when you purchase new brass. You'd be surprised how inconsistent new brass can be. If you don't trim all of it, at least check it. Second, when the length exceeds the maximum. Most auto pistol rounds headspace on the case mouth. If they get too long, you'll end up with excessive headspace and possibly a ruptured case. To check case lengths, I'd suggest getting <A target="_blank" HREF=http://www.midwayusa.com/midwayusa/applications/eproductpage.exe/showproduct?SaleItemID=481104>one of these</A> for each caliber you reload. They'll make checking them for max length much faster.
Now, for a couple of extras.
In one of your other posts, you mentioned using fillers in loads that don't fill the case. I highly recommend that you AVOID this at all costs. I can't think of one powder manufacturer who will recommend using fillers and the only equipment manufacturer that I am aware of who still talks about using fillers is Lyman. One of my favorite gun writers, Mike Venturino, has said that he has seen numerous firearms with "ringed" chambers which he attributes to the use of fillers with smokeless powder. Whenever possible, try to use a powder that will fill up the case as much as possible. Sometimes, like with the 45 Colt, this just can't be done. Powders such as AA XMP5744 will come close, but it's an extruded powder and doesn't meter well through a powder measure. The only reasons to be concerned about filling the case are (1) consistency and (2) the possibility of "detonation". Consistency can be a factor in pinpoint high-power rifle shooting, but the effect on accuracy from slightly different powder positions is negligible in pistol/revolver shooting. We could talk about theoretical detonation for days. It's like UFOs. Some people believe even though they've never seen. No powder manufacturer has been able to reproduce detonation in the laboratory. Mike Daly of Hodgdon Powder Co. has flat out said it doesn't exist. While I still think there may be something to it, I think the most plausible explanation of blown up guns, which have been attributed by some to detonation, actually concerns crimp. A SASS member has purchased equipment and done extensive testing in the area of low volume loads and detonation. To date, he has found no evidence to support detonation based solely on low volume charges. His theory based on his research is currently centered around bullet pull. I'll try to explain it as I understand it. When using a small charge in a large volume case, the powder can be spread out across the bottom of the case in a thin layer instead of being pressed up against the primer hole. If low bullet pull exists (improper sizing or insufficient crimp), when the primer ignites the initial blast from the primer jumps the bullet out of the case and jambs it into the rifling/forcing cone. The powder charge then ignites but instead of being able to build up pressure normally and give the bullet a running start into the rifling, it must try to start a bullet moving again that has already engaged the rifling and "boom", a blown up gun. Of course this all happens in milliseconds, but it is the best and most plausible explanation for what is attributed to detonation. If there's even a chance he's correct, the answer is simple. Good, firm crimps and correct neck expansion (usually about .002 under bullet diameter). Will using a heavier crimp shorten case life? Yes. You may only get 10 loadings out of your pistol brass instead of 15. Is the extra 5 loadings worth the risk of a blown gun and possible injury to the shooter or bystander? Not to me. For most calibers, though the initial cost is high, brass is the cheapest component in the reloading process due to the quantity of loadings from the one investment. For all calibers that require a good crimp, I highly recommend the <A target="_blank" HREF=http://www.midwayusa.com/midwayusa/applications/eproductpage.exe/showproduct?SaleItemID=217484>Lee Factory Crimp die.</A> I have one of these for every caliber that requires a crimp and they do an outstanding job.
Well, that's enough opinion for now. If there's anything else you would like my opinion on (which with 50¢, may get you a cup of coffee /w3tcompact/icons/smile.gif), don't hesitate to ask.
Hoss