I have had very good results in my CZ 452 and Anschutz 1907 using SK Biathlon Sport. (I shot the 50m 1/2 inch group challenge with SK Biathlon Sport).
SK's website lists it at 1106 fps, which is 33 fps faster than their Rifle Match ammo, but it is still sub-sonic. (Remember that all published rimfire muzzle velocities are averages, and each lot and within the same lot will vary quite alot).
At 50m I sometimes don't notice the elevation difference over the standard velocity ammo (SK, Lapua, Eley). However at 100m to 200m, that extra 33 fps of the SK Biathlon makes a big difference in dialing elevation.
I find it interesting that the SK Biathlon Sport muzzle velocity is rated slightly faster than their SK Long Range Match ammo.
As far as lube goes, the SK Biathlon lube feels to me to be more dry waxy, less wet slimy than the other SK match ammo.
I thought that one of the functions of lube is to aid in chambering of the bullet without shaving or gouging as it passes the sharp chamber edge?
I do not have experience with the Eley Biathlon ammo to compare. On their website they list their Eley Biathlon Club as 1060 to 1085 fps, which contrasts significantly with SK's Biathlon at 1106 fps. I like that Eley acknowledges that there is a spread of velocity in their product. Whereas SK/Lapua states one number, which we know is an average with unspecified spread.
While it's not possible to determine SK lot average MV's from what's on the box, Lapua "averages" can be determined by the lot number. This is done by putting a "3" in front of the first two digits to get the lot's average MV in Lapua test barrels --
e.g. a lot number of 28554/605042 will have a Lapua-rated average of 328 m/s or 1076 fps.
Unfortunately, it doesn't mean much because shooters can't know the MV of any variety of ammo, or even its average MV, until it's chronographed with a particular rifle. The actual average obtained with a chrony may be faster or slower than any information available on a box.
Regarding a big difference in dialing elevation, a round that had an extra 33 fps MV (1106 fps vs 1073 fps) would strike 0.74" and 3.2" higher at 100 and 200 yards respectively, a wee bit more at 100 and 200 meters.
SK Biathlon Sport is "rated" by the manufacturer as having the exact same MV as SK Long Range Match ammo. Any difference between the two observed on published SK charts, such as the one below, is a result of the factory using test barrels of a shorter length with the biathlon ammo (biathlon rifles typically have barrels shorter than position rifles).
Regarding the purpose of lube, while it may offer some help in chambering rounds, its primary function is not to steer rounds into chambers but rather to lubricate the bore to a consistent level to help contribute to consistent ammo performance. This is why "seasoned" or fouled bores will shoot to POA and unfouled bores often will not. In other words, it's necessary to have a consistent coating of lube in the bore to have more consistent ammo behaviour downrange.
When it comes to chambering rounds, if bullets are otherwise being shaved or gouged on their way into the chamber, there are other issues involved that is not the responsibility of the bullet's lubricant to avoid. Lapua biathlon ammo has a different bullet shape to help with chambering; Eley Tenex Biathlon offers a reduced cartridge diameter.
With regard to MV averages offered by different match ammo makers, it's a good thing if Eley provides a range of MVs associated with their products such as Biathlon Club (1060 to 1085 fps). It helps remind shooters that Eley can't tell them what the average MV of their product will actually be in any given rifle. It's worth keeping in mind, however, that this range doesn't really help narrow down what an actual MV might really be. Actual MV will always be the product not so much of barrel length, but rather of bore characteristics.