Does anyone have an experience with RL 15 and 577NE? Dacron filler vs foam wads, etc...Load data pretty scarce out there. I don't have any experience with reloading the 577, but I'm in need of some guidance as I'll be taking delivery of a new double soon. Thanks!

Yes have loaded a lot of 577 and only use RL 15. 750 Woody with 115.0 of RL 15 and about a 1" piece of 5/8' backer rod nets about 2040-2050fps. Start low of course as RL 15 lots are not very consistent.

Plus one for McKay on RL-17..I used Dacron by weight, but the foam wads from Britton that I bought at SCI each year are the best IMO..