Star & Bullock is the only place that sells the .54 Richmond Sharps bullets, that I know of. These bullets are perfect.
36 cal. Paper Cartridge Former Master Kit
With this Deluxe kit, I can make paper cartridges for both my Sharps Rifle ( Infantry ) and Sharps Carbine ( Richmond).
I love this little tool. It's actually my second. I have a new army 44 also. My only problem is the paper not always burning up. I am going to start nitrating the paper first. Other than that, Great product.
Instead of modifying my Walker to fit the bullets, about 1-2mm to long to fit the loader, I'm going to use my Dremel tool to modify the bullets removing 1/2 of the material from each end. I do NOT recommend using more than 45gr of powder in the Walker, it's capable of 60gr but that will damage the barrel to the point of having to replace it or the revolver won't shoot... I have 2 Walkers, made checking my issue quite easy.