For 220 gr speer 49 gr of IMR 4320 is the ticket. All three shots usually touch at 100 yds from my Mannlicher. 48gr for 225gr bullets.

Thanks lynn, I will try it. That seems to be the powder I have most of for the 358.

I like IMR4320 in my Sako 358. I can't remember the exact charge, but it's somewhere around 49 to 49.5 grains. I also like the Sierra 225 BTSP.

The best powder I ever found for the .358 was AA2015br,no longer made.(would like to find some) I shoot a blr81 with 20"bbl so I've been looking for a replacement. So far this is what I've found 47/3031/200 hornady = 2520 next 54/748/225 = 2460 next 53/748/250speer = 2370 I have used the .250 grn load the most for black bear and it puts them down on the spot !

RL-10 seems to burn a little faster than IMR 3031 or maybe about the same but it's of finer grain and more will go into a case like the .358 Win.

I like 180 Speer Flat Points for deer and black bear and I just tried some RL-10 in the 99F. I started at 45.0 grs and chronographed velocities from 2616 fps and worked up to a very high velocity and I still had no real pressure signs that I can see. Extracton, head expansion and even web thinning on this rear locking lug rifle was not a problem at all.

The brass for this rifle is now made from military 30-06 cases as it has .003" headspace over the go gage which is about the field gage. Primers were WLR and Fed 210M's.

Another test a couple of days ago got good groups again and 2716 fps with 48.0 grs. The next test is at 48.5 grs.

All of my .358's are 99F's or a collectors item M 70 so I am not going to push it and anyway this bullet at 2700 drops deer right there.

If I had a Ruger however I might use the drop tube like I did for test loads and there could be over 2800 fps available from this combination.