If the target is stationary, it is much easier to hit with a shotgun. But in most normal hunting usages for shotgun, the target is moving, and this requires learning how to "lead" the target, which takes practice.
yes
yes
I certainly don`t know of any law against a pistol grip on a shotgun in our state of Wisconsin, this is the state I live in and I know many law-abiding hunter that have pistol grips on their shotguns , I mean what would be the sense of making that illegal it`s no more dangerous than just a regular grip I think.
No. Barrel must be at least 18" and overall length no less than 26"
Depending on the gr/ the harder you squeeze the more speed the bullet travels(lol)/
Depending on the distance to your target, that would likely be an Olympic style target pistol, such as a Hammerli or Pardini FPE. For ranges of greater than 50 meters, a bolt action pistol in a rifle caliber would be a good candidate. Many can trace their origins back to the Remington XP-100.
Yes
No. Slate is harder. Slate is shale that has been heated and compressed.
Laser speed guns can target ONE specific vehicle, where radar may read one of several vehicle. Laser is harder to detect in advance, and harder to jam than radar.
No, Limestone is harder than chalk.
No. Diamond is harder than emerald.
No, diamond is harder than enamel.