There's actually a group that develops and tests 16 gauge loads, esp. light pressure loads for older doubles. There's quite a few 7/8 and even 3/4 oz. loads that have all been pressure tested. I'd advise against using the Lee data; with all the variables it would be quite easy to concoct a load that's in excess of max. SAAMI pressure. Your gun probably won't blow up, but over time they could cause undue stress, premature wear, etc. BTW I used the Lee data years ago when I first got into 16g's. Like you, I shoot a model 12 16g, which it a fairly light repeater, and I find 1oz. loads rather obnoxious. There's a membership fee of $20 to the 16 gauge reloaders group, but that gets you all the data, and any new data that members develop. Well worth it IMO. Check your PM, I'll send the group coordinators email.