lead, angle and pressure curves

J

JRB

Guest
I have just had a my chamber jumped to get a fresh start.
I had a real nice load with good velocity, before jumping the chamber. Now I had to come back about 1.5 grains to avoid pressure signs. My velocity is down too.

Has this been caused by the throat being rough off the reamer,[ not yet polished by the bullets] or the lead angle being 'refreshed'? and sharper?
How many rounds will it take till i can get back up to my previous load?

Jim
 
Have you adjusted your seating depth so that your bullets are in the same relationship to the rifling as before? If you went from jumping to in the rifling, that would account for an increase in pressure.
 
I must add that my barrel had about 1200 rounds down,
so the throat was changed alot from new.

I was quite surprised to have to come so far back to get shooting again.
After about 100 rounds i will do some pressure test again and see.
Jim
 
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