I agree with Kirk , Frank you seem to have it nailed down any thoughts ?

Gents, thanks for your feedback. I'd stocked up on PB and 7625 when they were going out of production and have some 4756 for heavies. I'll routine stop a small gun shops here and there while on my travels to check for more. Last I looked at the Hodgdon's website, several months ago, PB was still listed but 7625 and 4756 were absent. I checked again today and PB is gone also. I haven't looked at other shotgun powders on the market to search for single-base alternates but when I do that I'll post here.

There are a great number of recipes on Alliant's web site. The one I use in all three of my 12ga. Parkers, two of which are Damascus Barrels, is
Remington Nitro hull
Remington 209 primer
17.5 grains of Clay Dot
CB4100-12b wad
7/8 ounce of 7.5 shot
1200 f.p.s.
5400 p.s.i.
The bushing in my Ponsness Warren drops 17.2 grains and the loads crush clays consistently. The recoil is also very acceptable.
Tom

I haven't try any , but Vectan makes single based powders

https://www.grafs.com/retail/catalog...r/vendorId/246

looks promising

For low pressure I've used Unique, 700X, Promo, Red Dot, American Select, and Green Dot to name a few. There are lots of powders out there for low pressure. Today it's more what you can get, not so much what you like.