I seem to have a tight spot in the neck of my brass, Its down near the shoulder and bottom of the neck. I can take a fired brass and start a bullet down the neck, the bullet will stop when it reaches this junction.(NECK/SHOULDER) Seems like a donut at the bottom of the neck. I have to think this is not good for ES. Fired 10 rounds this morning ES was 87 fps.
I can feel MORE resistants when seating bullets, They started down with even pressure then increase as they break thru the neck into the shoulder area.
I reamed the inside of the neck twice now. Tonight I reamed for the second time, bullet droped staight thru into the case with no resistants. Resized the brass and the tight spot returned.
Now I measured the shoulder to base before resizing and after. Only moved the shoulder back .002, If I don't bump the shoulder I have a stiff bolt- if I do I have the neck tension problem.
Bumping that shoulder is tricky business. I bumped that shoulder back .002 is all and it cuased all that neck tension trouble. I'm started to think there's more resizing done to the walls of the case than the shoulder. I have heard so much about shoulder bump in my short reloading career, it seems logical to think we need to push it back.
I have achieved the tension I want--about .001 or less press. Now all I have to do is wait the rain out. I have 11 rounds loaded I want to run thru the crony. Hope to drop that ES of 87 down quite a bit.
There's a fine line between good headspace and a sticky bolt.
I will report back the results of those rounds as soon the rain stops.
to try to avoid your neck junction , perhaps try to use a full sizer set just 0.002 under your chamber headspace ( to allow easy chambering
with a radius junction between neck and shoulder slighty bigger than the chamber radius big problem with regular die ( not custom design for BR ) they are made with two reamers one for the body and the shoulder , one for the neck so you get a sharp angle between neck and shoulder and you put stress in brass material a lot with a radius you sucess to bump your shoulderand size neck .
you can use a full sizer as it with bushing to set the neck sizing you want
on short neck case best is to resize up to 90% of the neck to get a longer aera long enought to avoid of center bullet and use a cocentric chamfer close the boatail angle to doesn t use the bullet as neck sizer mandrel .
K&M i beleive makes the most popular tool for removing donuts--im sure someone on here has ken's Phone#--i dont right now.
you get donuts from neckturning--happens all the time. the fat part just on to the shoulder flows forewad into the neck causing the tight spot--yes it is a killer on SD.
--should be able to find him on an internet search. ken markle/K&M products (i think)