I don't see a lot of data on these, so i though i'd share what i found. I have a 1:8" tikka t3x in .22-250 i just picked up. Has the 22.4” tube

I have some 85gr nosler RDF and 85.5 berger hybrids.

I can find info on noslers site for H4350, which should load somewhat similar to IMR-4451, which is what i have on hand. Not much info on the bergers, so here is my data so far:

Here is some velocity testing from today's range session.
22.4” barrel, magnetospeed sporter.
IMR-4451
Lapua brass, new. CCI-200.

Berger bullets, .002" jump
38.0gr--3,229
38.5gr--3,249
39.0gr--3,302, slight bolt lift. 38.5 will be my max. I should've started well under 38gr.
39.5gr--3,328
40.0gr--3,407 these last 2 didn't have severely heavy bolts, but they were a bit stiffer than normal, bit of a shiny ejector mark. 38.5 will be my max. I will probably back off a couple grains from there when i start testing for consistent velocity and accuracy.

Nosler 85gr RDF
35.0gr--2,897
36.0gr--3,000
36.5gr--3,041
37.0gr--3,146
37.5gr--3,158
38.0gr--3,236, possibly a teeny heavier bolt lift
38.2gr--3,276, should not really have kept shooting past here. I think 37.5 will be max load, and I'll test further between 36 and 37
38.4gr--3,264
38.6gr--3,233
38.8gr--3,271