Thanks for your patience here, I've been out of town for a few days. Just back this evening.
Stephanie and I took the 500 cones with the 550 pots backpacking in the Tetons a few weeks ago, before we added them to the site. Based on the advice of Alan Dixon, who's had a great deal of involvement in tuning the cones for the smaller pots, we used 15ml of EtOH to boil 16 oz of cold water, which he claimed was the optimum for the 500 cones/500 pots.
We found that 15 ml of fuel was sufficient for the 500 cone/550 pot as well, so when I added these to the site last week, I labeled them as 500/550, not realizing that there have already been individual versions released for the 500 and the 550 pots, with the 550 cones apparently tuned to about 15% greater efficiency with the 550 pots than with the 500 cones.
People who have purchased the "500/550" cones will be contacted by Addie to see what they would like to do with their new cones, she will give you a few options.
We will change the product description of the 500/550 to 500, and we'll discontinue this product, in favor of bringing in the 550 cones that TD has developed specifically tuned for the 550 pots.
Thanks for being patient during MY state of confusion, I certainly appreciate it!