You'll find the maker's load tables here
https://explosia.cz/app/uploads/2016/11/reloading_Lovex_EN.pdf
Very European cartridge orientated, so 260 Rem isn't included.
There are also more data on the US Shooters World website, SW importing Explosia (Lovex) powders and bottling / distributing them under its own names in the USA.
Reload Data - Shooters World
(Use the 'Interactive Data' facility as it contains more cartridges than the other option.) It does include 260 Rem data for three UK available powders.
Single-base tubular grades all start with 'S0' and possibles for your trio of cartridges are
S060 a fast burning grade, rather faster than H4895, but usable in 308 Win / 150gn and probably 22-250. (SW doesn't do this powder, so no data in its tables)
S062 a tad slower burning than H. VarGet. Potentially suitable for all three of your cartridges. (US SW table shows this as 'SW Precision' and it has data for 22-250 and 308 Win)
S065 too slow-burning and bulky for 308 Win, usable in 22-250 and 260. (US SW table shows this as 'SW Long Rifle' and has data for 22-250 and 260 Rem)
S070 a slow-burner usually associated with the 4350s, but IME a fair bit slower burning still. Suitable only for 260 Rem. (SW4350 in the Shooters World US data)
There are also three potentially suitable ball-type double based Lovex powders:
D073.4 (AR-Plus in SW data) a fast-burner but with data for 22-250 and 308 Win.
D073.5 (No SW equivalent) Probably OK for 308 and 22-250, but a bit fast burning for 260 Rem
D073.6 (SW 'Match Rifle') might be usable in all three cartridges, but Explosia doesn't have any 260 Rem data, and SW doesn't list this one for the cartridge.
I'm very fond of the S-series tubular grades - work well and clean burning. Not temperamental.
I have used the three D-series ball powders, but a long time ago and they may have changed. I found they give high performance, but were dirty leaving a very hard coating on case-necks that tumbler cleaning won't remove (but steel pin wet tumbling would). (I'm going to try D073.5 and D073.6 in heavy bullet 223 later this year as H4895 and VarGet replacements.)