design and alloy
- Thread starter fiver
- Start date
A bore rider needs to be engraved but it's a case of too much of a good thing ain't a good thing. For example you don't want the rifling holding the bullet tight enough that when un-chambering a round it pulls the bullet out of the case. You do not want to seat the bullet deeper in the case when chambering a round and you don't want to snug of chambering in defense or hunting ammunition. Many scenario's and some of it depends on what your doing.
Might just be poor accuracy.
Sometimes you may recover a bullet intact enough to see the damage.
Sometimes it is all supposition but we make changes to prevent or reduce it and the issue goes away.
So much of this is based on empirical data. We cast and load, shoot, and see what happens. We draw conclusions. We makes small changes and see what happens.
Sometimes you may recover a bullet intact enough to see the damage.
Sometimes it is all supposition but we make changes to prevent or reduce it and the issue goes away.
So much of this is based on empirical data. We cast and load, shoot, and see what happens. We draw conclusions. We makes small changes and see what happens.
Ian
Notorious member
Engraving the nose when chambered (static engraving) and engraving the nose when fired are two different conditions, which may be confusing here. You always want the nose engraved when fired, most of the time for HV shooting you want more than that, you want nose metal flowing out into the grooves about halfway up to the ogive or more. When just chambering the round, though, you can do it either way as the bullet shape and action type dictates.
So do we.
What matters is learning from those failures and using that knowledge in the future to problem solve.
Ian
Notorious member
Then try a bullet with a tapered nose, like the AM 31-188G or the NOE 30 Hunter. OR, try a two-diameter bullet like the 165A, but realize you'll have to size it a little smaller than the entrance to the funnel so that bigger step can poke up inside there a little ways. Realize also you may be velocity limited with that combination because all you have to steer the bullet is that narrow point of contact with the front band in the tapered throat, like putting a soup can in a transmission funnel.....tell me if it wants to go straight or keep falling to the side?
bns454
Active Member
I am bad at notes,I really need to start keeping track of all things.
bns454
Active Member
My failure in mold design was the AM 30-180-H,but I think I can fix it now after reading this thread.The front band is .324 front to back,it only enters the barrel .100 any more and it sticks a bullet.I nose sized the front band to .323 1/2 way down,now when I chamber It I get about 60% of the bullet lightly engraved.Like your pictures here.Am I going the right direction ?