CCI 34s are the harneded military primers. Same process and mentality as the CCI 41s that are used to load military 5.56 ammo.
I can say this - CCI 41s are about the equivalent of a magnum primer, and they do run hotter velocities than most any opther small rifle primer out there. The nearest match to a CCI 41 would be a CCI 450 small rifle magnum primer.
Same deal with those 34s - CCI 200s are standard large rifle primers, the 250s are large rifle magnum primers, and those 34s are about on par with the 250s, just with a harder material, in order to prevent accidental firing from firing pin contact.
So, with your brass already loaded with 34s, start your charge weight about 0.3 lower than what I'm running, work up to your best group that doesn't have pressure signs, and check your speeds. You'll outrun me, for certain.
When I'm working on a brand new combination, I start a little low, and work those different charge weights up until I DO SEE pressure signs - ejector swipes, flattened primers, slightly cratered primers, etc. That tells me "too much..." I go back down to the next load that was most accurate, under the pressure load, and work from that charge weight. 0.1 up and down from it, find the best group, shorten seating depth 0.003" and see if it improves...