So I ordered the 500 pack jumbo case of .223" 55Gr SP Dogtowns from Midway.
I started loading and found a load that seemed to group well. The Chrono shows that it is flying at about 3350FPS. So I went out with a box to do my final sighting in this morning.
When what did I spy with my little eye??? Lead vapor following the bullets!! I re-Chrono'd and the velocity was the same.
I called Midway to ask what the RPM limit was, and the answer was the published "Keep them under 4000" So I asked him with what twist barrel, Since my FP has a 1-9 twist.
He had no answer, but gave me a Sierra tech number. Said they were "Familiar with our products" Which I think means they make them for them. In any case, I think that the Dogtowns are essentially the Blitz's, NOT BLITZKINGS. IF that is so, they have a rough RPM limit of around 240,000. This means that I'd have to slow to about 3000FPS.
Anyone else have a similar experience, or know about what the Rotational limit is??