Remington core-locked has really proven itself to me too. If it aint broken don't fix it!
I must say though, the new Remington core-locked ultra looks pretty impresive too but I can't remember a time when the original has let me down.
If you want to properly preserve velvet antlers, you will have to inject & brush them with formaldehyde or some of the new less toxic chemicals (4 in 1 solution works great as does Knobloch's antler in velvet tan) as its easier to use however, both will work.
First, using rubber gloves take a razor blade and make small incisions at the tips of all points about 1/8". Next hang the antlers upside down, allowing the blood to drain. Starting at the bases inject the solution into the...