Normally, with that 1 1/2" drop in length, a reduction of about 50fps would be made.
The larger the case compared to bullet diameter, the greater the drop.
Normally, from say, 24" to 20", the drop would be in the 35fps range, per inch.
There seems to be a critical length, where the drop in vel. is even greater and with many ctgs. That seems to be 20" for many, and dropping from there further, will have increased drop per inch.
As noted, it depends on the ctg.
Of course in California, you will need to use a mono bullet anyway. The Hornady 80gr. GMX or Barnes 85gr. TSX will fill the bill.
So - Hornady or Federal ammo load those, seems to me.