I have had good luck with IMR4350 and obviously I'm not alone in that. However the downside is that IMR4350 is still relatively sensitive to temperature changes - when chronographing handloads using IMR4350 in temperatures ranging from 100 degrees F. down to 0, and quite often they'll fall 100 fps or even more. Sometimes this doesn't matter much, but sometimes it does.
In addition to the temperature sensitivity issue, IMR4350 meters rather poorly with its long grains. However both problems were pretty much taken care of by the introduction of Hodgdon's H4350 "Short Cut". This 4350 both meters pretty well and is relatively temperature-insensitive, especially to cold. Actually, the term should probably be "temperature-resistant," since people in the know say they haven't tested a powder yet that doesn't gain velocity (due to higher pressure) at temperatures above 70 F.
Noted gunwriter John Barsness (
Handloader, Rifle, Guns) has this to say which is of interest to us general handloaders - probably because
we tend to find a powder that works in our one or maybe two .30-06 rifles and stick with that - as opposed to people like John that get paid to not only experiment with new powders, but have
several .30-06 hunting rifles to try the load out in and is a major .30-06 fan:
...if you have been loading your .30-06 with IMR4350 and any bullet weight from 150 to 220 grains for many years, then you might as well go ahead and keep using the same load. That powder still works for anything worth doing...
For decades I bounced back and forth between IMR4350, Hodgdon H4831 and Alliant Reloder 19 when loading 180's in the .30-06. All worked pretty well, but none stood out so much across several rifles that I could pick one load and stick to it. Then, a few years ago, I tried Ramshot's new Hunter powder with 180's. The first experiments took place in my old NULA with Barnes then-new Triple Shock X-Bullets. Eventually I worked up to 58.0 grains. Accuracy was very fine and muzzle velocity was right around 2800 ft/sec.
I have since tried this load with different 180's in several .30-06's, including my Sauer drilling. Accuracy has been universally very good, and in 24" barrels velocity around 2800 or even higher. Ramshot's own data goes up to 60 grains (with Hornady BTSP Interlocks) but I have never found any reason to go beyond 58.0 grains. The load has worked not only in the NULA and Sauer but in the .30-06 barrel for my T/C Encore and a fine pre-'64 Model 70 Winchester. In the Model 70 (with no changes other than adjusting the trigger and making sure all the screws were tight, including the forend screw) the load grouped around .5" with Sierra GameKings and .8" with Nosler Partitions at 100 yards.
In fact, when I went to New Zealand in early 2007 to test Berger VLD's on wild goats and big red stags, I immediately loaded up 58.0 grains of Hunter behind some 185 VLD's, and got 100-yard groups of .4" at 100 yards, with a muzzle velocity of 2862 ft/sec. Combined with the very high ballistic coefficient of the VLD's, this made shooting at long range very easy in the New Zealand mountains. So now I do have a 180-grain .30-06 load that works in several rifles.
Sounds good! I'm interested. Especially as it is a ball powder that meters well and is one of the "temperature insensitive" powders as well.