Main problem I ever had with the Duplex-Loads was patterning = they didn't very well pattern reagrds to some simple Win#4 1-7/8s & Fed Premium #4s 2oz. But that's in my my shotty, & YMMV.
I could never find out what distribution the #shot size was = how many #6 versus how many #4s .... no matter really, 'cause they never really patterned worth a darn anyways.
Besades, all the Duplex loads cost way more than anything which actually performed much better.
Betcha your best bet would be to blow off any of the duplex-stuff, just pattern a decent #4, if going for turkeys,or anyhing else heavy.
Any load, 2-3/4sof #4s, or a magnum, that pattern swell in your chosen choke, is about as good as you'll get.
Personally, I use the Fed Premium, #4 shot = 2 oz in my Rem Turkey choke.
Shoots tight as all get out - but that's just mine - has a huge rating for complete turkey kills, & has done so.
I'd suggest trying a few others though.
My second best is The Win 1-7/8 ounce load of #4s & about $12-14/box of 25 (about 1/3 the price of the Fed Premiums). A very good bet for cost effectiveness. I ended buying about 2 cases of this stuff just because its relatively cheap, packs a goodly punch for anything you'd want a shot gun to do, & it patterns pretty well in any of my full or modified chookes - a very good all-round heavy load.
Whatever.
Buy a few 5-packs & pattern for your choke.
If you lke the results, buy more of it & use it, but I'd betcha that there's some off-the-shelf stuff that will work just as well - & for 1/2-1/3 the price. You just have to play some.