motorcycle_dan
05-26-2006, 10:46 AM
This according to the Lyman site:
http://www.lymanproducts.com/lymanproducts/index.htm
They say leading occuring at the breech end (what happens in my XD .45ACP pistol) is caused by gas leaking around the base of the bullet causing leading.
I looked up Obturate and found it was Swelling for lack of a better term.
Which makes me contemplate several things.
1. Lube grooves - I'm currently shooting a 228gr Lee RN bullet. It seems to be working pretty well but I do get some slight leading at the breech end of the barrel. I'm thinking of going to a single lube groove bullet design. Either the H&G #34 or the Lee 200gr RNFP. What are the advantages of single vs. double lube grooves? Would a deeper single groove allow the gas to "obturate" the bullet base better than the shallower twin groove?
2. As mentioned several times here, recovered bullets usually have the lube still in the groove. Will multiple lube grooves that are shallower provide more lube or less?
3. What exactly does the lube do? Does it lube the bullet it is on as it travels down the bore? Or does it lube the barrel so that the "NEXT" bullet gets a pre lubed bore in which to slide on. I've asked this question of several seasoned casters and never got an answer that made sense.
Appreciate any insight people could lend. All of my casting is for pistol. My lead is made up of wheel weights 90% and linotype 10%. I cast them frosty from a Lee 6 Cavity 225gr RN. Size them with a star sizer and some kind of brownish lube sticks that came with the used equipment I bought.
As for rifle bullets, I have not convinced myself that rifle bullets are worthy of my casting. Besides, I can shoot just about as far as I can see with a .45
Dan
http://www.lymanproducts.com/lymanproducts/index.htm
They say leading occuring at the breech end (what happens in my XD .45ACP pistol) is caused by gas leaking around the base of the bullet causing leading.
I looked up Obturate and found it was Swelling for lack of a better term.
Which makes me contemplate several things.
1. Lube grooves - I'm currently shooting a 228gr Lee RN bullet. It seems to be working pretty well but I do get some slight leading at the breech end of the barrel. I'm thinking of going to a single lube groove bullet design. Either the H&G #34 or the Lee 200gr RNFP. What are the advantages of single vs. double lube grooves? Would a deeper single groove allow the gas to "obturate" the bullet base better than the shallower twin groove?
2. As mentioned several times here, recovered bullets usually have the lube still in the groove. Will multiple lube grooves that are shallower provide more lube or less?
3. What exactly does the lube do? Does it lube the bullet it is on as it travels down the bore? Or does it lube the barrel so that the "NEXT" bullet gets a pre lubed bore in which to slide on. I've asked this question of several seasoned casters and never got an answer that made sense.
Appreciate any insight people could lend. All of my casting is for pistol. My lead is made up of wheel weights 90% and linotype 10%. I cast them frosty from a Lee 6 Cavity 225gr RN. Size them with a star sizer and some kind of brownish lube sticks that came with the used equipment I bought.
As for rifle bullets, I have not convinced myself that rifle bullets are worthy of my casting. Besides, I can shoot just about as far as I can see with a .45
Dan