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Hand operated case trimmers are made of metal, not rubber, so any inconsistency in trim length is due to the user, not the tool.

First, as a matter of perspective, I don't know that it's possible to make perfect case neck/mouths unless you cull those that aren't perfect. Individual cases vary too much for that and they harden a little with each successive use but, it IS possible to make them better. But making necks...

The baffle does nothing if the powder level is below it.

You're vastly over agonizing the issue, all reloading data is basically generic by powder type and bullet weight. Differences between the guns and case, powder and primer lots easily exceed any slight differences bullets may make.

You're agonizing over the wrong things, the press hardly matters and, contrary to what you may read, precision reloading doesn't come in a box of the 'right' tools! If that were true all top shooters would be using the same tools ... and they don't. Easily portable arbor presses came into...

There's no calibrated way to suggest what the average results of your interesting "precision reloading" list will accomplish. If any of it matters at all will be due to YOUR rig and YOUR loading and shooting skills. And averages are meaningless when applied to individuals; on average, all...

Tumbling media rarely "wears out" but it does get a hard cake of dried, blackened metal polish all over it when too much polish has been added. I quite using polish decades ago, glitter is nothing but newbie eye candy anyway and there's no way I'm going to use anything containing ammonia on...

There are no magic numbers. If your loaded ammo chambers and shoots well, the seating is fine. If not, experiment until it does.

You must set your OAL with that center screw thingy onthe seater die. It isn't possible for an OAL to be "all over the map" nor is it possible to measure such a thing; say what you're talking about if you want a reasonable answer.

#4: "VELOCITIES (don't know why, but the FPS went DOWN with the deeper seating. Seems the more the case capacity was reduced, the velocity was reduced? Always seen or expected velocities / pressures go up when deeper seated with the same powder charge. This one has me scratching my head."...

Your best bet for a tripple beam in grains is from ebay, they get listed occasionally but tend to go costly. Most are Ohaus scales sold under the Lyman brand name. Personally, I think you're beating a dead horse. Multi-beam lab scales for reloaders used to be common, they were and remain...

Well, I would agree that you got one very good group out of your specific 16" SCAR17. But, with your other groups running around 1 1/2" I wonder how frequently you will see that .425" repeat itself.

You have some good comments and some half (or less) truths here. Bottom line first, all dies are, on average, quite good and usually produce ammo of better quality than most rigs or shooters can notice, the difference on targets between 'good' dies and the very best is often measurable in...

I don't care for bushing dies so I don't have any but you're over simplifying the case shoulder lengths of those cases.

" ...a few people have mentioned that they were "too soft"..." Web 'expert' BS.

Charley, you don't say why you want the datum line but if it's for reloading, it hardly matters. For us it's a relative thing, all we need is a point of reference between fired and resized cases to confirm we are resizing the shoulders back to just equal or a tad less than the fired location...

Dariof, when people tell you "What I use is ....", all you can know is what they use, it doesn't tell you a thing about the value of what they use. A press is a press. They all wok fine and personal preferences are often based on "conventional wisdom", aka web hype, price or "what my expert...

I've used a lot of presses over the last fourty years; the supposed value of a magic presss for accuracy is vastly over rated. Ammo is made in the dies, all a press does is push cases into and pull them out of dies - they all do that quite well. A user who knows what he's doing can load...

People who use Lee's factory crimp dies incorrectly always get incorrect results but that's not the dies' fault.

" I'll have to do more research before I buy a bunch of useless dies." There are no 'useless dies' on the market.