Some more options:
Eley subsonic/low recoil
http://eleyshotshells.com ARMUSA 'Vintage'
http://www.armusa-performance.com Kent
http://www.firearmservice.com Another 16er and I were discussing options for pheasants and this might be helpful for someone with a 2 and 1/2" (65mm) gun:
B&P shells are 67mm but used in 2 and 1/2" chambers without reported problems
https://www.bandpusa.com/Shopping/product_selection.php F2 CLASSIC 16 Size 4, 5, 6, and 7 available
Lead: 1 1/16 oz.
Case: 67mm. (2.62 in.)
FPS: 1280
The F2 Classic is NOT a low pressure load at almost 10,000 PSI
LOW PRESSURE LOADS:
ELEY GRAND PRIX 16 ga. 2¾ Dram 15/16 oz #5UK Fiber Wad, 1225fps
Price: $85.90
With uncompromising quality Eley have introduced a line of 67.5mm loads for 21/2" or larger chambers to suit the 16 bore hunter with high antimony shot and hard hitting performance. This load utilizes a Plastic Hull and the Eley KLEENA Fiber Wad in UK#5 (equivalent to a US #6 shot)
http://65.36.235.175/merchant2/merchant.mvc?Screen=CTGY&Store_Code=ES&Category_Code=16ETG Polywad Vintager
16 Gauge, #6 Shot, 2-1/2"
Vintager-XXTRA, Buffered "BioWad"
(Case of 250) Vintager 2-1/2" 16 Gauge Shotshells - Low Recoil Low Pressure
24 Gm (about 7/8 oz.), #6 Shot, 2-1/4 Dram Equivalent
http://www.polywad-shotgun-shells.com/16gavin6/ RST has both 7/8 oz. and 1 oz. loads in 5s and 6s available.
http://www.rstshells.com/shells-best.htm And the Polywad Spreader 2 1/2" load for those tightly choked classic 16s
http://www.polywad-shotgun-shells.com/spreader-16-gauge-loads/
