I understand. I'm assuming that it takes about a year to get a new machine built and tooled up, then it takes some time to get the bullets run and fine tuned to pass all the QC steps. Plus I understand that there probably was a "wait and see" attitude to ensure that the increased demand wouldn't be a blip on the screen and have the demand decrease a year later. Also, being a limited market for this particular bullet, there probably was a big drain on the company resources keeping up with demand for the more popular products, which would entail even more machines being built and time spent getting them up and running first.
But, if you step on the other side of the sales counter, even with all those things factored in, 8 years seems to be a long time from announcement to "it's coming sooner than you think" with no firm product shipment date yet.