If you buy from some sources, like nibs.com, the (unaltered) nib will be tuned before shipping. In their order sheet there is a place to indicate if you want a wetter or drier than "normal" ink flow. I have bought an number of Sailor 1911S & Sapporo/Sapporo-Mini pens from them throughout the years (no affiliation).
The only unmodified nib I received from this shop wrote (flowed) well enough with the limited variety of Sailor & Iroshi inks that I used at that time, but I did not like the factory MS nib, so this pen too went to Classic Fountain Pens.
Since every one of my nibs (at the time) were reground by John M. before delivery, I had all kinds of opportunity to describe to him the level of "wetness" that I wanted for each nib. All these pens originally sported massive MS (1.15 mm.) nibs that were then reduced to more modest grade italic shapes (stubs or CI-s).
As I acquired more Sailors & other pens, I checked out the work of other well known nib-techs. Some techs used words to describe ink flow, while others used a number system of 1 to 10 or expressed as a fraction, like 7/10.
By this time on my fountain pen journey, I started favouring much drier inks, both dye-based & iron-gall. My usual number for required "wetness" would be at least 6/10, but usually more.
Eventually I became a huge fan of Pendleton Brown's work (no affiliation). He has "BLS"-ed a number of JoWo & Bock nibs for me. All the feeds from one well known German nib manufacturer had to be physically altered to get adequate ink flow through to the nibs. So,...feed performance may be an important factor in achieving a satisfying writing result.
My Sailor feeds, I must say have never let me down. These feeds (I have two distinct versions for the smaller 14c nibs) must have an excellent ink buffering system, as their flow seems to remain constant, from a full to an almost empty converter. Not quite so good with some of my contemporary EU brand pens.
This December I received a Sailor Pro-Gear Slim "Fire" with a B nib that I decided to keep, just as it has come to me from the factory. My original plan was to send this pen off to Pendleton for a "BLS" customization, but the pen wrote so incredibly well out-of-the-box that I couldn't part with it. Smooth, yet with subtle feedback & a controlled delivery of my dry inks, I'm on with this Sailor. This pen's nib tamed Pelikan 4001 Blue/Black ink,...no mean feat.
Edited by tinta, 22 February 2020 - 21:07.
*Sailor 1911S, Black/gold, 14c. 0.8 mm. stub(JM) *1911S blue "Colours", 14c. H-B "M" BLS (PB)
*2 Sailor 1911-M Burgundy/gold pens: 14c. 0.6 mm. "round-nosed" CI (MM) & 1.1 mm. CI (JM)
*Sailor Pro-Gear Slim Spec. Ed. "Fire",14c. (factory) "H-B"
*2 Kaweco SPECIAL fountain pens: 14c."M" "B",-0.5 mm & 0.7 mm stubs (PB)
*Kaweco Stainless Steel Lilliput, 14c "B" -0.6 mm. stub (PB)
*Montblanc 254, 14c. "BB" (1.1 mm?) flügelfeder factory stub