43-287B
- Thread starter Brad
- Start date
The recovery bucket worked but a bit too good. Bullets are heavily mushroomed.
The wider, deeper grease groove looked like it makes the situation worse,not better. There is more lead on the gas check than before. You can see how much of the forward portion got moved to the area where the grease groove was.
Looks to me like a stronger base and weaker nose is a better solution.
I didn't fire any for group, this was totally a test to see how the recovery bucket worked and what the fired bullets looked like.
The wider, deeper grease groove looked like it makes the situation worse,not better. There is more lead on the gas check than before. You can see how much of the forward portion got moved to the area where the grease groove was.
Looks to me like a stronger base and weaker nose is a better solution.
I didn't fire any for group, this was totally a test to see how the recovery bucket worked and what the fired bullets looked like.
fiver
Well-Known Member
that is my theory.
I have always gone overboard on strong base bands.
you realize what I requested was kind of a modified keith bullet.
Ian
Notorious member
I'm trying to keep within the original intent of your design, Brad, that being to have as much support/alignment as far forward as you can get it in the cylinder throat. You ran in to the same problems I did with a long-nosed TC design and for the same reasons, but I also had no groove on the really long nose band and had very shallow lube/crimp grooves. I really think deepening all the existing grooves and adding a steep, narrow groove to the nose band will solve your metal displacement problems.
The last bullet you shot failed because the base had too much pressure on it trying to crush and squirt that huge, SOLID nose into the barrel. It's a hydraulic system at that point, so the fluid will go to the path of least resistance, which is what you gave it by hogging out all that metal from the lube groove. It got so fluid it splashed all over the forcing cone and congealed on the gas check.
You don't want the whole bullet to flow, you want to break it up into little compartments that each flow only a little bit, on the outer edges, leaving the CORE of the bullet intact and un-squished. Once you crunch the dendrites of the core, the whole bullet is going to become a fluid and distort. To do that, you will have to cut the grooves a lot deeper than .425 and forget the idea of a bore-riding groove in the nose, that simply will NOT allow enough room for metal to go without causing the entire nose portion to elongate. I'd go down to at least .400, .380 would be better, at least for the nose groove.
The last bullet you shot failed because the base had too much pressure on it trying to crush and squirt that huge, SOLID nose into the barrel. It's a hydraulic system at that point, so the fluid will go to the path of least resistance, which is what you gave it by hogging out all that metal from the lube groove. It got so fluid it splashed all over the forcing cone and congealed on the gas check.
You don't want the whole bullet to flow, you want to break it up into little compartments that each flow only a little bit, on the outer edges, leaving the CORE of the bullet intact and un-squished. Once you crunch the dendrites of the core, the whole bullet is going to become a fluid and distort. To do that, you will have to cut the grooves a lot deeper than .425 and forget the idea of a bore-riding groove in the nose, that simply will NOT allow enough room for metal to go without causing the entire nose portion to elongate. I'd go down to at least .400, .380 would be better, at least for the nose groove.
waco
Springfield, Oregon
This is the bullet Brad.http://accuratemolds.com/bullet_detail.php?bullet=43-310D-D.png