I've been using 700-X for the past 45 years of reloading. It's a great powder for target loads and service-level loads in .38 Spl, .44 Special, .45 Auto and .45 Colt. I've found it consistently accurate, mild of recoil, and economical. I've also used it for 12 gauge target loads, back when reloading 12 gauge was actually economical. Never had a problem with inconsistent charges.
What's not to like?
Reloading 101: If you are using a powder measure - any brand - you need to FILL the hopper (not partway) and allow the powder to settle to get consistent thrown charges. This is true with ANY propellant. This may require 5-10 throws of the measure before it settles in. No powder will be consistent simply dumping it into the measure. The measure must also be solidly mounted, and your operating technique CONSISTENT.
Reloading 102: If you are using a powder measure with a progressive press, after the above procedures, you need to additionally run 5-10 rounds SIMULTANEOUSLY through the complete cycle - resizing, belling, charging, seating and crimping - to allow the powder to settle in the hopper, and be thrown under the same force conditions as you will be using in your volume loading. This is done AFTER you have adjusted the measure to throw the exact charge you want. This will require WEIGHING those 5-10 charges after you throw them.
Apparently, there are many ignorant (not a sin) and/or lazy (inexcusable) reloaders. Using the above well-known and proven reloading methods, you will not have a problem with consistency with 700-X. Have used it with great results in the Dillon 550, with extreme variations of 0.1 grain or less.
I've also used Titegroup in many similar applications, in addition to target and service loads in 9mm Luger. It's a great powder as well. Very economical, very accurate and consistent. I use the Dillon 550 and on every handle stroke, see the powder bar moving. I've never had a squib or double charge that way.
If you are hand-charging a loading block full of cases, it's true a bulkier powder will make it easier to tell if you mistakenly have double-charged a case, during your pre-seating inspection of the cases. I stopped using that technique my first year of reloading - it is too easy to make a mistake. If you are not using a progressive press, you are far better off and safer charging each case individually and THEN placing it in the loading block. This way, only charged cases go into the block, and YOU put it there AFTER charging it.
BTW... storing powder in the hopper is a bad idea. Some, like Titegroup, will etch the plastic container. Always empty it back into the original container after finishing reloading your batch.
Also... on the issue of leading & Titegroup. ANY fast burning propellant, at near-max levels, will cause leading, especially in rougher barrels. There are so many factors involved including bore/cylinder throat/forcing cone diameters, bullet hardness and diameter, and pressure level, that making a blanket statement about Titegroup - or any other propellant for that matter - is meaningless. I have had leading - and no leading - with all kinds of propellants. The loads I have used regularly with Titegroup have no leading, otherwise I would not be using it.
Be safe. Reloading is a great hobby, but requires time and careful attention.