Have some 58gr VMax coming wanting to vaporize some groundhogs! Going to fire form some brass and use the Lee collet die, been having real good results with that.
We've used a small variety of combinations in a small variety of rifles so far, for the lightweight bullets we WERE using 4166, but now that that's out, general rule of thumb we play by is varmint weights up to and including the sierra flat based 85 gr run the imr4064, the I4350 and h4831 also work well enough with the 85 and up categories. H1000 with a 95-100 gr bullet also works pretty decent, as in if you need a deer load, and can't find a 4350 or h4831, grab a pound of h1000, uses a little more powder/load, but still a solid choice. For our prairie shooting, we enjoy the 55gr nbts (pretty close to your 58s) in the prairie dog towns (and our mid range charges of the faster powders) for splodey/fun factors, calling coyotes, the 85 gr Speer or 87 vmax are more preferred for bucking the wind. Been wanting to play with the 95 berger and 103 eld as well for distance (we have a couple savage-1:9.25"). I really like the 95 nbts, 95ssts, 85 sgks, and 100 gr sierra prohunters on deer and pronghorn, when each are used appropriately to their job, the 90gr tipped sierra was kinda like a 90sst (not quite as tough as an nbt) but it did the job too. In general my go to for prairie shooting is the nbt to buck wind and stay splodier longer, won't come apart so bad up close compared to the sst/speer types, if I was guaranteed all shots would be under 300 yds the 85 sgk and 100 gr prohunter are both phenomenal, and I'd include that I have stretched the prohunter to 500 and don't hate it, it's an impressively TOUGH bullet, if I have to throw a load together I always make sure I have those flat bases(prohunter) and h1000 on hand (won't tell you how to live, but if you try it you'll find out why). The copper bullets are OK, but keep the impacts above 2200, I'm leaning closer to 2300 nowadays. And yes the accubonds and partitions are reliable, but unnecessary. This cartridge provides lethal wounding with speed and precision, if you don't try to punch a splodey bullet through a shoulder at close range you should have a good many smiles.
