Powder for AR15 Blackout using COATED CAST BULLET RNFP 158

[linko]

Hi

I have some COATED CAST RNFP 158 GRAIN bullets and Lil' Gun powder

I see H110 is often used for the blackout loads when using cast bullets.

I don't have this powder. I am looking for an alternative to use in an AR15.

Lil' Gun is right in there on the burn rate chart. Any one use this powder substitute?

I dont have any other powders around this burn rate.

[Wansingct]

I've found Lil' Gun to be my preferred powder for heavier-projectile super sonic loads. I use H110 for my 110gr bullets, Lil' Gun for 125-160gr and 1680 or CFE BLK for heavy subs

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[kayala]

Hodgdon have recipes for jacketed 150 and 168 gr bullet on their website with Lil'Gun, might be a starting point for you.

[linko]

I have seen 13.5 posted for 160 grain lead and Lil Gun.
Hogdgon shows:

13.0 starting for a 180 gr jacketed bullet
13.8 starting for a 168 gr jacketed bullet
13.9 starting for a 150 gr jacketed bullet

is there a rule of thumb that cast bullets need less powder than jacketed bullets?