I've posted these before, so here it is again.
These are the loads I use in both of my Savage 12's.
One is a VLP and the other is a BTVSS. As always START 5 to 10% below and work your way up.
35 bergers, 25.5 gr of RL-10X and 26.8 gr of benchmark
40 bergers and 40 V-max, 24.5 gr RL-10X and 25.5 gr of H-4895
39 sierra BK and 40 gr Nosler , 25 gr RL-10X and 27.5 gr of H-4895
32 V-max and 32 gr nosler, 26 gr RL-10X and 27 gr H-322 and Benchmark
26 gr varmint grenade, 26.3 gr RL-10X, and 23.3 gr H-4198
45 gr hornady sp, 24.3 gr RL 10X
38 gr wildcats, 25.2 gr RL-10X, 25.3 ramshot X-term, 26.1 benchmark
My loads are near but not quite at MAX.
I've used horndy, winchester and remington brass. Hornady was horrible for reloading. Remington was not to bad. The winchester was the best one. Nosler would be better but don't have it out here in Alberta for the 204. I only use the magnum/ bench rest type primers. They have a "thicker cup" as compared to the regular small rifle primers.
For accuracy, RL-10X has a slight edge over benchmark, but does foul the barrel quicker.
I use "redding competition dies" and I only "neck size" until I feel slight resistance in the bolt. Then I use the body sizing die to bump the shoulder back, trim, and neck size, This extends the life of my brass.
The brass I have that has had 9 firings (winchester) will be annealed before I reload those again. Factory barrels are 12 twist. For most barrels the 12 twist is just on the edge for stabilizing 40 gr ballistic tip bullets. Some do , some don't. Bullet stabilization has more to do with length than weight. The 45 gr hornady sp has a SHORTER overall length as compared to the 40 gr V-max which means that most factory barrels will stabilize the 45 gr sp. As for the 26 gr varmint grenade. This lead free bullet is fairly long for it's weight therefore it also will do quite well in most factory tubes. They have a lousy BC (like a styrofoam cup) and at 200 yds, the 39 gr BK catches up to it and royally kicks its butt in trajectory, wind drift, and energy. They are awesome out to about 250 yds and then they just run out of steam. Here is a photo I took of some 20 cal bullets for camparing lengths.
http://predatorhuntcanada.ca/forum/showthread.php?t=201&page=3
I now have another 204, grey laminate, stainless, in a T3 lite. This one will be my main calling yote rifle and will be fed a diet of 38 gr wildcats and 35 & 40 gr bergers and 45 gr sp's. So far it has been just as accurate as my heavy barrel savages.
Try a box of factory 45's and your barrel will let you know if it likes them or not.