Moly coated bullets

O

old owl

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Don't know if I'm in the right section but I'm puzzled.........
Does anyone coat their bullets with moly?
If the answer is YES why do you do it?
Does it reduce barrel pressure?
Does the chony record higher speeds?
Or do you do it to save ware and tare on the lands?
Does it prevent copper build-up in the barrel?
 
Yes I moly coat all my match bullets and have since the moly coat kit first hit the market. It does reduce barrel pressure and velocity so you need to bump up the load slightly to get the same veloicty as bare bullets. I can't make a claim either way about barrel life but will say it won't double the life of your barrel or reduce it either.
With moly bullets I can go much longer between cleanings. I have gone over 800 rounds and still won matches.
 
Great Time to ask...

I used to shoot air springers and have a fair bit of loctite brand molly paste left. I want to start reloading 9mm for my Glock and was wondering if I could use the molly that I have on hand to lube the cases prior to using my Lee Classic handload kit or should I get the proper case lube?

Thanks
Cactus
 
Cactus said:
Great Time to ask...

I used to shoot air springers and have a fair bit of loctite brand molly paste left. I want to start reloading 9mm for my Glock and was wondering if I could use the molly that I have on hand to lube the cases prior to using my Lee Classic handload kit or should I get the proper case lube?

Thanks
Cactus
Click to expand...

Carbide pistol dies won't need lube. If they are sticky, it won't hurt, but not necessary. Unless you have 30 year old steel dies if course.
 
My understanding is that using moly bullets is of little benefit if the bore is not first moly treated. Once the moly has worn away from the bullet as it travels down an untreated bore, copper is again suspended in the plasma behind the bullet and is deposited on the bare barrel steel. Once this occurs, the drag between the bullet and the bare steel is what it would have been with naked bullets. When a subsequent bullet is fired, copper fouling from the previous shot is now moly coated resulting in a potentially rougher bore, where the purpose of the moly is to make the bore smoother by filling microscopic voids in the surface of the steel, and slippery by providing two opposing surfaces that have a very low coefficient of friction. A slippery friction free surface should result in higher muzzle velocities. When both the bullet and the bore have been moly treated, little copper fouling can suspended in the gases behind the bullet, resulting in less fouling and a longer duration between cleanings. Barrel life improves, at least in theory, because the barrel steel is no longer in direct contact with the flame of the propellant, and because less cleaning is required. It is difficult to get anyone to go out on a limb and say how much barrel life is improved, but one does hear 10%-15%. Of course we hear many things.
 
OK guys, I get that, but if you work up your load to maximum using moly bullets in a treated bore, is the velocity the same as the maximum load with a naked bullet in a naked bore, or is the maximum moly load faster? If it takes more powder to get you back to where you were, you should see greater velocity at equal pressure. Pressure and velocity are related but not the same; but 50,000 psi does not always mean 2800 with a 180 if you change one of the other parameters, such as the friction, between the bullet and the bore. If I shoot 2 bullets of equal weight, but one has a long bearing surface the other a short, I can get greater velocity with the bullet with the shorter bearing surface at equal pressure, although like a moly coated bullet, it requires more powder to get equal velocity. It would follow then that higher velocities could be attained with a coated bullet.
 
Without knowing what the pressure really is all I can go by is the velocity. I am sure I can put at least another gr or more of Varget into my .308 cases but I am looking for max accuracy not max velocity. With bare bullets the best accuracy was around 2940-2950 fps with 155 SMK's. When shooting moly bullets I needed .5 gr more powder to get the same velocity as the bare bullets. I also change to different 155 gr bullets with the same load without a lost of accuracy. I have not check to see if there was much change in velocity.(something maybe I should do). However if I find Lapua's, Nosler's, Berger's or Hornady's to be a few fps faster or slower, I really don't care as long as the accuracy is still there.
 
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