Lapping FL die

[Dusty Stevens]

actually, I believe it is not too oversized. my drawing is not that good. those are dimensions of brass, that has sprung back. and my points of measurement arent marked nicely, for instance, 12.10 isnt the lowest part of the case head, its a spot above it (the lowest part is 11.95) etc etc. It took me maybe 2 hours today to lap the die with various grit compounds, to achieve the (what I believe is) a desirable result - sized case doesnt rattle now when inserted into the chamber. It wont be overworked, from now on, I think? After the initial firing from new that is.

Id mark that die so as to not use it when you get a more believable chamber next time.

 

[sharp.shooter.ser]

Id mark that die so as to not use it when you get a more believable chamber next time.

of course, this die is for this chamber only. I dont have another FL die for 47 L, just the neck die.

 

[JohnKielly]

Well, we will have to agree to disagree. I have one RCBS #2 shell holder that has .010 taken off the top with a surface grinder. I use it to load everything that uses a .473 case head. The dies are all set up to bump the shoulders to my desired amount. And I don't have to readjust anything when changing calibers.

I agree. You had to adjust you dies to the shell holder. Therefore if you have your dies adjusted to a standard shell holder in the manner I said, then once you modify it, you need to readjust those dies. If you modify the die with an issue, that's the only on you fiddled with.

 

[Dusty Stevens]

I agree. You had to adjust you dies to the shell holder. Therefore if you have your dies adjusted to a standard shell holder in the manner I said, then once you modify it, you need to readjust those dies. If you modify the die with an issue, that's the only on you fiddled with.

Ive never had a die that contacted the shellholder except a real small base die. So for most it makes no difference. Some setup their dies according to the die’s instructions and i guess it matters then. Most accuracy minded shooters set their dies to match the chamber giving the smallest bump possible and if the die is quality and the chamber is right it doesnt touch.

 

[powderbrake]

I have to adjust my die throughout the life of the brass as it changes. Its not a set it and forget it thing unless youre not actually going back and checking it

You are correct. I end up rechecking it with each new lot of bullets for seating depth, so I check the case sizing as well. So far the case sizing has been pretty steady.