I have the 358 BLR and have loaded quite a bit for it with 180/200 and 220/225 bullets. I've obtained excellent accuracy in with IMR 4064. There may be a few powders that give faster velocities, but it has been a great all around powder. It gave me this 3-shot group with the 200 Rem CL:

[Linked Image]

and this 10-shot group with the 200 Sierras (the top one was my fault):

[Linked Image]

Results were comparable with the 200 Hornady and 180 Speer.

With the 225 TSX, I've used IMR 4895, 3031 and Viht N-135. With 4895 and N-135 I got 2400+ fps. It is compressed fairly well with both. I may work with some other powders but I bought these before the 200 TSX's were made and I think if I were to use this bullet, I'd lean towards that weight. In addition to the above powders, with the 225 GK, I've also used AA 2520, Varget and IMR 4064. I was able to approach 2500 fps with a few of these powders. Some claim this bullet is ideal for the 358's velocities but I can't say, I've never shot anything with it. For me, in the 225's, though I haven't loaded them, I'm leaning towards the Partition as long as I get decent accuracy. I have not tried any 250's but after JB's article in Handloader and TAC, it's on the list. It's a great cartridge...I don't know of anyone who's been disappointed in it.