I have a couple noob questions

[panzer10mm]

What exactly is keyholing, and what is the glock smile? (i don't have a glock but i'm curious)

Thanks

[CitizenOfDreams]

Tumbling bullets that are not properly spin-stabilized leave keyhole-shaped holes in a paper target.

There are at least two unrelated phenomena referred to as "Glock smiles":
- A bulge at the base a spent case caused by the shape of a Glock chamber (esp. in 10mm and .40S&W);
- Wear marks on a Glock barrel where it touches the slide.

[panzer10mm]

That's wierd because all of the cases I shoot out of my dan wesson have this bulge your talking about. Is the bulge attributed to a loose chamber or is it just a byproduct of the 10mm or 40 s&w case at high enough pressures?

[B__]

In your case you likely need a stronger recoil spring to hold the gun in battery longer. Pretty much all 10mm should run a 20# spring or higher. 20 is plenty IMO though.