2900 is getting pretty fast in a 20". I usually aim for about 2850, tops. The highest velocity I've clocked in my guns is 2945fps from a Nosler 70RDF & 24gr of H4895. I can't tell you if that will work with a 69. I have no idea if it's a one & done load either. The primers didn't dump, but the pockets may be loose. I don't know, haven't tried loading them again.
H4895 has a good rep for making FPS, but so does TAC and a couple others.
