Alot of sub-links at that BPI link below. I couldn't find anything about mylar wraps. But I'm also curious what kind of spacers or wads you guys are using between powder and the shot cup. I haven't been using anything other than 85gr 777 immediately under and unslit 3.5" shotcup (BPI) of #6 HeviShot. Excellent patterns at 40 yds. Flopped a gobbler at 46yds last season. No problem.
But always looking for better. May try some TSS#8 or #9. Curious about "spacers" between powder and cup....and also within the cup if I want to use something less than a full.
Thanks for sharing any thoughts.
You might try adding mylar wraps to the inside of the shot cup. Here's a link to some from bpi. http://www.ballisticproducts.com/searchprods.asp