Slugged the barrel of my G20SF. As I have come to expect, the glock is grossly oversized. The slug measure .402"
That would mean I would expect leading unless my cast Bullets were at least .403. And it is hard to load in spec ammo with bullets that far over size. Either the case mouth is on the large side or the bullet gets squeezed down during crimping.
I plan to run powder coat Bullets through it. Probably will try some Lee 175 grain swc tl I have that weren't sized as well.
But this makes it clear to me that the problem with Glock and lead is that the groove diameter is too big.
I haven't had any issues running mine with the 0.4015" with Carnauba Red Lube from White Label lube. ;)
I did like the Zambini Red but they are long gone! :(
I am still thinking about powdered paint liquid transfer shake & bake... :o
.4015" with a good lube and not overly hard should "bump up" just fine.
The real travesty here is that Glocks are hard to load lead for since by the time you get the bullets big enough around, it is really hard to keep the ammo in spec. Or worse, you get guys who don't educate themselves about using lead bullets, buy a box of rock hard .401" slugs with crayon lube, and then complain that lead bullets suck.
I just like to keep these posts up there so people that want to shoot lead understand the special circumstances that apply to Glocks. Either get an aftermarket barrel or a really good understanding of how to shoot leading free.
Or just paint em' ;D
I should slug my gen 4 barrel...
.401
But that's read with a caliper, not a micrometer.