Wogpotter,
Copyrights used to have to be applied for, but now are automatic when you author something. You don't even have to use the copyright symbol anymore, though you can choose to use it to act as a reminder to people you have a copyright. I put that on my images, usually. I have a policy that shooters can copy them freely for private use, but, as has happened, if someone from a money-making operation wants to use it in their operation, they have to make a donation to a veteran's charity.
Having that automatic copyright can be useful. Suppose, for example, I authored something but then found out a child exploitation site was "giving me free advertising". I'd want that stopped, pronto, and would be grateful for the right to stop it. For that reason, there is some discussion of even links to a site being covered by copyright ultimately, but the courts haven't gone there yet, AFAIK.
We don't have a problem with you putting up links to a product. It becomes an issue if it is a drive-by post, consisting only of a link with no contextual introduction to explain it. It's also an issue when it is a link to your own product, or to your own forum. In those last two instances it becomes a sales or promotion activity and runs afoul of the rule against advertising.
Noelf2,
I can't figure out the purpose of what you are calculating? In the first instance, suppose I have 5" between the two widest spaced holes in a group. I divide by two, to get 2.5", which is less than 3", so I stop dividing, per your instruction. But my group is still 5". So, why did I do that?
In the second instance, I don't how dividing some number of inches by two gets you MOA? MOA is arrived at by taking the inches between the widest spaced points of impact in the group, multiplying that number of inches by 300, then dividing the result by the range in yards, and then dividing again by pi. It works for rifle or pistol.
