RL-22, hands down, but MRP is a near dupe of that performance wise.

The newer '23 or '26 might bring something more to the table, but my loads work fine & I have no desire to work up new loads as long as '22 & MRP are available & I have good supplies of both.

For lighter bullets, RL-19 is a tad better than '22 & H4350 is also good if you have it.

MM