I used a little bit of Oxi-clean in the final cooking to whiten it up. As far as sealing it I am going to wait and see just how much oil still leaches out of it. The last couple of water changes that I did to the pot still had a little bit of oil on the top of the water so I suppose that there is still some in it. As for the peroxide I have a bottle of it along with a powdered bleach to put on it if I decide that I need to do it. But I am going to wait for a while to see what happens to it.
I measured the the upper cutters on my biggest one today and they measure out at 11/2" exactly.
Didn't measure the lower ones but definately shorter. Obviously mine is not big enough for any record keeping but I did get a score sheet that they all seem to use. It's the same as for a lion or bear. Here's the link to SCI.
In my experience if you only use peroxide they will stay white but if you use any actual bleach they will yellow. I did my first couple with bleach because that is the term people used and they yellowed badly after about a year like you said. I quit using bleach because of something I read somewhere and only use peroxide now. I have never had another problem.
What does "gauge" mean anyway? As used here gauge means the number of round lead balls the same diameter as the inside of the barrel (aka the bore) that it would take to weigh one pound. It takes 12 lead balls the same diameter as a 12 gauge barrel to weigh a pound. The smaller 20 gauge would require 20 balls of that barrel diameter. The larger bore 12 gauge would require 12 lead balls of the bore diameter to weigh one pound.
In general the number of pellets in a shotgun shell...