[ezz555]

This is the best Alliant can do for you. I guess you will have to decide on how the Winchester primer compares to the Remington primer or give Alliant a call.

Alliant Powder - Reloader's Guide

Alliant Powder - Reloader's Guide

 

[rosies dad]

Ive been using up some Unique in 20 ga loads, and use 15.2 grains with CB wad and Cheddite primer. I use the same load with 3/4 oz shot and the CB wad for 3/4 oz. Im running low on powder, and eventually will change to 20/28 when I can find a 4 pounder.

 

[Hailstorm]

This is the best Alliant can do for you. I guess you will have to decide on how the Winchester primer compares to the Remington primer or give Alliant a call.

Alliant Powder - Reloader's Guide

Alliant Powder - Reloader's Guide

So if I go by WAA20 wad data (WAA20) is a sub for CB1078-20 the powder drop is 16.5
One person recommendation of 15.2 seems to low

 

[henrydog]

"Seems low" is not a term that should be in a reloading discussion. Use published data, or just buy a box of factory shells

 

[mg1polo]

So if I go by WAA20 wad data (WAA20) is a sub for CB1078-20 the powder drop is 16.5
One person recommendation of 15.2 seems to low

Alliant does not list any data for your combination of components.
Remington - Hull
Winchester 209 - Primer
CB1078-20 - Wad
Unique - Powder
7/8 oz - Shot

 

[saskbooknut]

Lyman #4 lists 14.0 Unique at 11,300 psi with Win 209 and AA20 wad, in Remington unibody hulls.