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Questions/Answers
If you start shootingMoly-coated ammo through a newmatch grade barrel do youalways have to?
I have a new AR-10T SuperSASS and it suggests that I should shoot Black Hills Moly-coated ammo for the best accuracy. If I start shooting moly-coated ammo first, will it damage the barrel if I go back to just match grade ammo? What if I keep changing back and forth between moly and regular match?
The moly bullets do produce different pressure profiles than the non-coated bullets. There is some transfer of the moly coat to the barrel, but not much and you will remove most while cleaning. Since there are different pressure profiles the SAMMI specs are what you need to go by. Even with some moly transfer to the barrel it wouldn't be enough to ensure same performance with the non-molys. Changing back and forth probably won't damage the barrel, but the pressure differences will effect the gas flow and operations. Ballistics and point of impact will also be effected by going back and forth. There is a similar issue with the Barnes coated bullets as to being a different pressure profile.I have heard even the TSX non-coated can change pressures as compared to standard construction bullets. I have a friend who reloads for his weapon and he uses a separate tumbler to apply a moly coat to his bullets before he loads them to the cartridge(never tumble loaded cartridges). Contact the manufacturer of your weapon to see if that is an option to save you from buying the Black Hills ammo. That is excellent ammo by the way. Again the barrel shouldn't be harmed, especially if it is the chromed type,but the other working components might have problems. Talk to one of the Company gun experts to see what other options are available too. If you reload for it, I do believe you will have to full length re-size and not just neck resize.
How to test to see if amaterial is really Chrome-molyor just steel?
I have a go-kart frame and I am trying to see if it is really chrome-moly or just regular steel. Is there anyway without harming the frame to see if its chrome-moly, something I can do to show its properties that it is chrome-moly?
It's difficult.... any reliable method would require lab equipment and destructive testing. The DIY way is just a crude possibility. 1) Industrial way: requires sample pieces for tests such as tensile or hardness test. Chrome-moly (usu. 4130 or 4140 Cr-Mo alloy steel) is stronger and harder than mild steel. But you still wouldn't know what alloy exactly without some metallurgical spectrograph. 2) DIY way: only if you can afford to scratch it a little (hope it's not nicely painted already) - do a simple hardness test. Pick an unimportant spot, sand off any coating/rust. Take a file and try to file the surface a little. Get a piece of mild steel and do the same thing and compare. If your part is indeed more difficult to file you know it's a harder material. Some technicians do this kind of thing and get a feel for the materials.... or instead of file, use a center-punch and see which surface dings easier. Or, Cr-Mo tubing are supposed to be thin-walled - because material is strong. If your frame is thin and light, and you've driven it - and it stood up to the abuse, it's probably something better than mild steel. 3) Ask more people - mountain bike shop maybe? Cr-Mo tubes are used in bikes but maybe less popular now due to new lighter materials.
Question about metal work:Isit possible (that ispractical)to weld Chrom Molyalloy to basic steel?
Just curious as to what is current state-of-the-art in TIG welding, I believe it shoud be possible to weld almost anything to anything (exception being brass & aluminium alloys) but what about either Stainless Steel or plain steel welded to Chrom Moly? any answers, links ... or?
Certainly its possible and regularly done. One of the acceptable filler rods for 4130 cromo is mild steel. You can join 4130 to mild steel without difficulty provided you treat the 4130 part properly-425F preheat and postheat to make sure it doesnt crack. eutectic makes a rod called tigtectic 66 AKA "copycat"rod which could also be used. One thing you shouldnt do it stick weld or mig weld 4130
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