Blackwater
10-20-2005, 09:57 PM
Fellows, I've been over at Mountain Molds playing with the designs, trying to see if I could learn anything. Bass gave me some answers to some questions that I think have helped. Hope to see for sure before long.
I've also been doing some searches on this site trying to get a handle (or a finger or two at least) on just how to design a good bullet. Trial and error isn't my forte', but unfortunately, vascillation and uncertainty are.
I also remembered talking with Jump some time back about one of the bullets he'd been using, and his saying something about "lube purging." Couldn't remember what that meant, so I did a search, and some of you newcomers might want to check out the thread at:
http://castboolits.gunloads.com/showthread.php?t=1671&highlight=lube+purging
I kinda' want to design a some moulds for high speed in my Whelen and my .30's and .31's. Want them on the heavy side, so they'll be long. As I 'get it' right now, the key to pushing a bullet hard on the back end in order to get higher velocity, I'll need fairly high lube capacity. The long bullets will be at higher risk of 'slumping' if not cast very hard, so I'll need longer bearing surface, which I THINK (???) means I'll need to go with a bore rider to get the lands at least to support more of the bullet along its path out the muzzle. To use a bore rider, I'll have to be very careful to get the bore riding portion to FIT really well, expecially if I drive it fairly hard. The throat will of course have to fit very well to prevent blowby.
Does this sound about right, or do I have yet a bunch more to learn before I can feel comfortable ordering a mould?
I've also been doing some searches on this site trying to get a handle (or a finger or two at least) on just how to design a good bullet. Trial and error isn't my forte', but unfortunately, vascillation and uncertainty are.
I also remembered talking with Jump some time back about one of the bullets he'd been using, and his saying something about "lube purging." Couldn't remember what that meant, so I did a search, and some of you newcomers might want to check out the thread at:
http://castboolits.gunloads.com/showthread.php?t=1671&highlight=lube+purging
I kinda' want to design a some moulds for high speed in my Whelen and my .30's and .31's. Want them on the heavy side, so they'll be long. As I 'get it' right now, the key to pushing a bullet hard on the back end in order to get higher velocity, I'll need fairly high lube capacity. The long bullets will be at higher risk of 'slumping' if not cast very hard, so I'll need longer bearing surface, which I THINK (???) means I'll need to go with a bore rider to get the lands at least to support more of the bullet along its path out the muzzle. To use a bore rider, I'll have to be very careful to get the bore riding portion to FIT really well, expecially if I drive it fairly hard. The throat will of course have to fit very well to prevent blowby.
Does this sound about right, or do I have yet a bunch more to learn before I can feel comfortable ordering a mould?