Alliant alternatives that fit your bill: Red Dot and Green Dot. Both will give you better case fill than a ball powder, work well at lower pressures, and use small charge weights. From older published data 148 LWC. The first numbers listed will be "target" load and pressure (psi) the second will be max.
Bullseye. 2.8 gr. 10,000. 5.7 gr. 34,000
Red Dot. 2.7 gr. 12,400 4.6 gr. 33,600
Green Dot.2.8 gr. 14,100 5.1 gr. 34,000
As these are both considered shotgun powders, they may be a bit more available to you.
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