I'm new to 45-70 and not having much luck in finding a trapdoor load for the Arsenal 45-70 330 Gr. RF boolit using 5744. Maybe 5744 is just not suitable for this boolit? Rifle is a new CVA Scout V2 45-70, 1 in 20 twist bergara barrel I believe, tight bore slugs at .457. I do have other powders and of course black, just wanted to try the 5744 I have on hand and start at trapdoor velocity/pressure. Thanks in advance for your comments.