I wouldn't get too wrapped around the axle about the long throat in your rifle. Long throats seem to be pretty common among 22-250's for some reason. Your choice of 52g bullets is optimum for the 14 twist according to quotes I have seen from Berger and Hornady ballisticians. Your choice of Varget is also a good one.
I have had good luck developing hand loads for my 22-250 using a combination of the OCW method found at the following link:
http://optimalchargeweight.embarqspace.com/
and the method of finding optimal seating depth recommended on the Berger bullets website.
Once you have found your OCW, seat your bullet as far out as you feel comfortable with. Then load a set of rounds for test seated .040, .080, and .120 deeper respectively. At least one of those four groups of loads will shoot markedly better than the others. Using this seating depth as your starting point, you can then fine tune your seating depth in smaller increments if you feel the need.
I have had my best results using 50g VMAX and 52g AMAX bullets with Varget in my rifle. 55g NBT's, VMAX, and Blitzkings also shoot well in my rifle, though many folks claim that the plastic tipped 55's won't shoot from a 14 twist. The only way to know is to try them out. My rifle will also stabilize 60g Hornady Interlocks, but not with enough accuracy to make me consider using them.
When I first started working with my 22-250, it refused to shoot factory ammo into much less than an inch. One factory load shot nearly 3 inch groups. Only one factory load shot under an inch and only just barely. My hand loads developed using the process outlined above immediately cut my groups to around .6 using the same bullets as some of the factory loads. The difference was bullet seating depths that yielded a longer than factory OAL (though still with considerable jump to the rifling).
I have also found it useful to pay close attention to the rate at which my barrel fouls and to watch closely for a shift in point of impact after a certain number of rounds. My rifle would start to foul after about 15 rounds starting from a clean barrel. After 15 rounds, the point of impact consistently shifted lower by about an inch at 100 yards. It would still group well for about another 20 rounds, but at the lower point of impact.
In attempt to reduce or eliminate the point of impact shift, I firelapped my barrel using the 3 finest grits from a Tubbs Final Finish kit. The point of impact shift went away and, to my surprise, accuracy improved slightly with my handloads.
The real shock came later when I bought a couple boxes of ammo in an attempt to find something from the factory that would shoot acceptably if I were to run out of my hand loaded ammo. Four of the five factory loads that I tried shot inside 3/4". Three of those five loads were from ammo that I had left over when I did my initial testing and break-in. All the previously tested ammo showed an improvement in accuracy and all five loads shot under an inch.
My results from fire lapping indicate to me that my barrel probably had a rough throat. If your load development process doesn't yield the results that you are looking for, it may be worthwhile to try fire lapping.
Anyway, your CZ is an excellent rifle. Don't give up on it. I hope that my experience with the 22-250 will be useful to you as you get your rifle sorted out.
