Originally Posted by texasdave
I have a 30-338 Lapua that the smith that built it changed the shoulder to a 38 degree angle on the case. My reason for asking this question is that forces me to fire form all the brass. I have the formula which is 19 g of unique and a 150 g molly bullet. With the shortage of supplies now days I have been looking for a way around fire forming and so far have not found it. My search then brought the question to my mind why was the shoulder changed? Do I really get anything more by doing that? I know I can not change this until the barrel needs to be replaced and I have not seem to have a capacity problem but I am sure there is a good explanation and I was hoping someone could explain it to me. I appreciate your time.
Did you buy it that way or did the smith change it without you permission.
If you bought it like that It should have been marked on the barrel that it was a 300 Lapua
38o. Any chamber that is not standard should be marked on the barrel ID.
The standard shoulder is 25o 67' so it has been blown out and top pressure loads should not
be fired in it.
If he chambered it with the 38o shoulder and did not check with you first then I would ask him
to set the barrel back and chamber it with the standard 300 Lapua mag reamer if you don't
want to fire form the brass.
The 38o shoulder will give you a little more powder capacity and may improve brass life but you will have to reform your brass one way or the other.
I have to assume that he made you aware of the difference and the brass requirements.
J E CUSTOM