Hollow base for large chambers 357/38

[Bird]

As previously posted, I have a Uberti cattleman with 0.366 cylinder throats. That matches to Uberti's production and drawing specs....why they make them that way, I don't know, and they don't have any cylinders with better specs. The max bullet size through the bore is 0.355'' to 0.356''.
Anyone here with suggestions, or especially experience with this or a similar situation?
I am thinking along the lines of a hollow base bullet to expand to the throat size upon firing. I am looking for 1,000 to a max of 1100fps. I would rather buy over the counter bullets for this, but if need be I will obtain a mold and cast my own if I must.
Any suggestions for bullets, ie manufacturer, thick or thin skirts, velocity, molds. I have unique and w231 powder.

[Tar Heel]

Mold: https://oldwestbulletmoulds.com/shop...e-358-diameter


Bullets: https://oldwestbulletmoulds.com/shop...w-base-bullets

[Mitch]

The .366 sure sonds realy big.So first be realy sure of what size your cylinder throats are use gage pins or slug them use a micrometer calipers are for ditch digging.
Myself i do not think yopu need HB bulets. depending on how hard you want to drive them the skirts may break off and cause other problems.I have a colt anaconda in 45 colt with the same problem. i had a mold made that drops the size i need then size them .0005 under the cylinder throat size.aeveal mold makera will make you any size you need Accurate and LBT come to mind.