Lead ?

[SgtDog0311]

Wayne, Great pictures!! I've got some decent casts but I can never get pictures like those... and I'd say your surfaces look a good deal better than my cerrosafe surfaces. Wonder if you heat it hotter or what. I trap air bubbles and such.

You are clear as a bell on the lube groove technique. I do it on a 40-63 whether I need to or not... just the way things work out. Transition step on that that one probably has a bit more wear on it even if it’s the same angle... given it’s age. In that one I again use a groove size, but this time because that’s all the chamber would tolerate, and with reamed cases at that!
   

I have got rings before on a 32-20 and one a 38-55. Some work on the throat eliminated them. In both cases you could drop a bullet in the chamber, tap it incrementally deeper and see lead being plowed. The tapered throat would not tolerate an oversized fit till we relieved the throat a bit.

IF YOU WERE going to modify a throat angle for an optimal transition to groove size for accommodating an oversized cast bullet, what angle would you prefer... and could you utilize the same angle in a variety of calibers (speaking to cast bullets running from 1100 – 1500fps here). I've worked on throats for both the 38-55 and a 32-20 already mentioned but that was solution shy of a ‘throat reamer’. Always wondered, had I got a throat reamer what angle would I have been looking for... optimal speaking.