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All Springer/NP/PCP Air Gun Discussion General > "Bob and Lloyds Workshop"
Comparing the Precision of Tin and Lead Slugs
rkr:
--- Quote from: subscriber on September 27, 2021, 09:32:21 PM ---
--- Quote from: Spacebus on September 27, 2021, 12:19:56 PM ---Is copper pipe suitable for casting copper bullets? I'm going to try and cast my own .45 ammo this winter.
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Not, if you are using an aluminum bullet mold:
https://steelforge.com/literature/metal-melting-ranges/
https://www.metalsupermarkets.com/melting-points-of-metals/
By the way, powder coating is plastic. Plastic that melts at low temperature and fuses to metal objects. It may be on Miles' list of plastics that foul bores. Then again, there are a number of people on this forum that shoot powder coated bullets and claim less fouling than bare lead.
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There are also people who size up their bullets with powder coating and it seems to work. I haven't tried it but it's getting rather common.
subscriber:
I think that plastic bearing surfaces could be addressed in marketing a viable projectile that truly works.
How many types of plastic are there? Just because one leaves a residue in a barrel does not mean all plastics will do that. On the other hand, rough barrels are going to tear off bits of whatever projectile material in contact passes through them. As long as these do not bond to the barrel...
Teflon has the same melting point as lead. Yes, Teflon has lower thermal conductivity and thermal mass than lead. It also generates much lower friction to build heat in the first place.
Teflon O-rings: www.mcmaster.com/o-rings/ultra-chemical-resistant-rigid-ptfe-o-rings-for-tube-fittings-with-straight-thread-connection/
MJP:
I have shot plastic sabot rounds alot and using abs, pla, pom, nylon and polycarbonate. None of them fouled the barrel to any noticeable degree when using silicone lube.
All three calibers actually cleaned the bore with sabots after there was some lead fouling.
Shot with .357 using .223, .457 using .257 and the 20mm using .452 and .50 projectiles.
Too much fussing and talking about how bad lead is, I call it BS from the eco people. We have shot cast and handled over a metric ton of lead and none of us have any measurable exposure that is to any degree unhealthy.
Oh the birds eat it, and so on... lead sinks and is not so easily soluble to water as its too heavy, as for plastic well we have a plastic waste island floating in the ocean. How much does that kill fish and birds?
Speak up on not banning lead and stop thinking about what to do with our hobby.
Marko
ballisticboy:
--- Quote from: subscriber on September 27, 2021, 09:32:21 PM ---It may be on Miles' list of plastics that foul bores.
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I don't have a list of plastics which cause problems, remember I used plastic in the lightweight slug type designs we experimented with 30 years ago. I am merely saying a lot of air gunners openly say they will not put plastic rounds down their barrels through either having a bad experience in the past or hearing all the stories of fouled barrels. There are certainly plastics where I am sure this would not be a real problem. The main problem, as I was pointing out, though perhaps you did not understand, will be getting over this prejudice against plastics.
subscriber:
--- Quote from: ballisticboy on September 28, 2021, 07:46:27 AM ---The main problem, as I was pointing out, though perhaps you did not understand, will be getting over this prejudice against plastics.
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Miles, I understood perfectly.
This is all hypothetical, but you get FX to market the plastic coated slugs, and Dubber and his buds to shoot them; and Bob's your uncle :). https://en.wikipedia.org/wiki/Bob%27s_your_uncle
If magic slugs cost too much, no one will buy them. If they work and don't cost too much people will be eager to try them. If they like the slugs, they will buy more.
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