safe load recipe for my Uberti Cattleman .45 LC

From Lyman 4th edition cast bullet
Saeco 300gn
Trail Boss 3.8gn/538fps/9300psi--- max ---4.8gn/668fps/13900psi
Titegroup 3.7gn/614fps/10800psi --- max --- 4.7gn/737fps/14000psi
Red Dot 3.8gn/604fps/10800psi --- max --- 4.8gn/726fps/14000psi
231 4.5gn/636fps/11900psi --- max --- 5.6gn/749fps/14000psi
unique 4.8gn/628fps/11200psi --- max --- 6.1gn/764fps/13900psi
This data is for the Saeco 300gn Keith type bullet. Since your bullet is 10% heavier I believe if you reduce these charges by a corresponding 10% then the pressures should run very close to the same.
With bullets in the 255gn range I like 5.8gn Trail Boss.

I enjoyed reading through that list Dan. Thank you !!
Unique is still our "go to" powder for any revolver load and most other "one handed" loads. It just works and unless you get way past Load Manual guidelines there is little to be concerned about.
Full blown "Mag Loads" are another realm of containers but old Unique takes care of 95% of our needs if we desire.
First pound of powder I bought when I ET'sd from the "Green Machine" (1974) was some Unique in the cylindrical cardboard steel ended containers.
Still have enough on hand in storage to run us out of primers.

Mike & Daniel, just awhile ago, rummaging thru my stash, I found a box of my reloads from the early 1970's. 40 loaded rounds, using "new" Remington Brass, 240 grn. Keith hollow point wad cutter bullets, over 7.0 grns. of Unique powder. I'm glad that I wrote the load recipe on the box, as back then, I had 2 "old" Colt SAA's, & the Ruger "New" Model Convertible Blackhawk that also had a .45 A.C.P. cylinder. I loaded it hotter than this box. I still have more than 1/2 of the 13 oz. yellow can left, that has been stored in sealed army ammo boxes in my garage since I moved here 19 Oct. 1973. Also, found a box of 45 loaded reloads that I bought about 15 years ago from a friend at a gun show, that have the normal 255 gr, rfn bullet loaded to standard factory pressures for the Colt SAA's. When I start reloading your bullets, I will have a buffet of loads to try.

Hello Mike. No, I haven't loaded anything yet, as I am tumbling about 350 Remington once fired brass from 30 & more years ago. I didn't have a tumbler back then, so just removed the spent primers & then resized & opened the case necks a bit, then put them back in the boxes & packed them away. I have learned not to remove the old primers before tumbling the cases in corncob media. Now, I have to pick corncob from the primer pocket on almost every case after tumbling them. I bought a Uberti Cattleman .45 Colt, with a 7 1/2" barrel after selling my old BP frame Colt. Daniel cast 300 various types of bullets for me, & a couple weeks ago, on a daytrip, found a small sporting goods store that had Unique powder in 1 lb. bottles (1 per customer) @ $39.95, so I bought 1, along with 200 CCI LP primers, $57+ total. Yesterday, I found 225  #457190 cast bullets that I made back in the early 1970's, that I'll have to lube. I have sizing / lube dies for .452 & .454, that fit in my Lyman 450 that is 50 years old, but only used for maybe 250 rounds, & is still in the box. I also found a box of my reloads for the Ruger Blackhawk "Convertible", .45 LC & .45 ACP cylinders, that I bought shortly after they came out, then sold about 20 years ago, with 240 Keith SWCHP bullets loaded with 7.0 grn Unique. I am now going to remove the bullets & powder, & reload them with about 5 grn. of Unique.  Also, yesterday, while trying to learn what sizing dies I need to use for my old Colt .44 W.C.F., made in 1906, I read that we need to be very careful, even with very mild smokeless powder loads, for the older black powder era guns, that the frames are made of iron, rather than steel. It  is recommended that if we do shoot them, it is best to use mild BP loads. The one that I had, I only shot 10 rounds thru it after re-barreling it from .38 spl., as I had heard about stressing the iron frames. Be careful.

I knew that after the government bought the Schofield pistols, they went to that cartridge, as it worked in the Colt also, & as it was a shorter case, dropped the powder charge, I thought to 28 grains, but you maybe correct at 25.

Rooting around my stash of old ammo & brass, I found a bunch of balloon head .44-40 cases. I ran them thru the Lyman Turbo vibrator with corncob media & Lyman case cleaner. I probably won't use them, but maybe someone for period accuracy, that will use BP in them, will want them.

Should be good for black powder loads but be careful they can age harden. If they crack at the mouth when belling that could be a sign that they have become brittle.

Michael, I attached pictures to an email I sent you.