Here is another powder which might just be on the shelves. IMR 8280 XBR. To quote from link below: "IMR has tested this powder from -40 to +165 degrees Fahrenheit with virtually no performance variation"
http://www.imrpowder.com/8208xbr.htmlI read about it on Accurate Shooter website:
Try Alternative Powders with Similar Burn Rates
For those customers who can�t find their favorite powder (such as Varget or H4350) right now, Chris suggests trying similar-burn-rate IMR- and Hodgdon-brand powders that are currently available in ample quantities. For example, Chris suggested that Varget users try IMR 4064. This powder offers excellent accuracy and a very similar burn rate. Likewise, if you can�t find H4350 you can try IMR 4350 or H414. Fans of H335 powder will find that Benchmark and CFE 223 are suitable replacement powders.
Of course, when changing to a different powder you can�t simply substitute loads. That�s a big no-no. You need to consult a good load manual or find a safe starting load on the Hodgdon Reloading Data Center. But you may find that, with a little load development effort, your �second choice� or �third choice� powder options shoot just as well as a previous favorite. We know guys who switched from Varget to IMR 8208 XBR in the .308 Win and they liked the 8208 XBR so well they never looked back.