I want to make up a 1-1/4 oz turkey load but like everyone else I have limited components. Here is what I have
Hulls:
Primed Fiocci with Fiocci 616 priomers
Fed. paper base

Primers: Cheditte 209
Wad: Rem. SP16
Shot: Nickel Plated No. 6
Powder: Blue Dot, Longshot

The Alliant load is :
1 1/4
1,260
Fed 209A
Blue Dot
SP 16
30.5
10,200

Problem is I don't have Fed 209A pimers and Alliant techs say not to substitute.

TABLE I

Shotshell Primer Comparison
Winchester 12-Ga. 2-3/4" AA Hull
17.0 Grains IMR 700-X Powder
Greenduster GT 9210-12 Wad
One Ounce No. 8 Lead Shot

Primer and Lot Velocity f.p.s. Chamber Pressure p.s.i.
Fed. 209A 03513 1251 (EV 14) 10,860 (EV 600)
CCI-209M D03C 1248 (EV 22) 10,460 (EV 1300)
Win. 209 NFL124 1246 (EV 22) 10,140 (EV 400)
Rem. 209STS 1236 (EV 16) 9,740 (EV 2200)
FIO-616 1234 (EV 28) 9,690 (EV 1600)
CCI-209 B032 1232 (EV 30) 9,650 (EV 2300)
Rem. 209P 127 1228 (EV 34) 8,810 (EV 2200)
Fed. 209 A8702 1226 (EV 18) 9,070 (EV 900)
Win. 209 MDL542 1224 (EV 30) 10,200 (EV 1700)
Cheddite 209 1217 (EV 20) 9,270 (EV 2000)

Comment: This listing is in the order of highest to lowest velocity. Maximum velocity variation between primer brands was 34 fps, while the maximum pressure variation between primer brands was 2,640psi.

The ballistics shown represent average performance for ten rounds with each loading using a 30 inch SAAMI test barrel with a 3 inch chamber and a 0.726 bore with skeet choke. Velocities were measured at 4 feet from the muzzle using an Oehler Model 33 chronograph in conjunction with the Skyscreen III system.

Pressures were recorded in pounds per square inch (psi) using a PCB 167A02 piezo­electric transducer in conjunction with a PCB Model 462B52 ballistics charge amplifier and a Model 451A07 digital peak meter. All powder and shot charges were loaded by scale weight using a Denver Instruments Accurate Load III electronic scale.

http://www.armbrust.acf2.org/primersubs.htm

Any issue with dropping back to 1 1/8 oz?

Less than 30 pellets difference.

Would that allow you to build a load with what components you have?

For a 12 gauge, I'd look for a payload of at least 1 1/8 ounce and a muzzle velocity of at least 1250 fps.
For a 16 gauge, I'd look at 1 to 1 1/8 ounce and a velocity of 1200 fps+.
My favorite shot size is #8's.