Easy-loading plastic sabots have been on the market for at least 14-15 years now. Even members here without computers 14-15 years ago could have sought help in solving their tight bore concerns.
In my early years of ML'ing (1992), I often sought-out ML shooters at local outdoor gun ranges and picked their brains on ways to improve my ML shooting, storage and cleaning concerns.
I'm still learning things about this sport, almost 23 years later. This year I studied hard on the benefits of having all-copper sabot/bullets and Blackhorn 209 powder. I am grateful to all the ML messageboard members at various websites for all that valuable information.
Surely, at some point in 2016, I will be shooting Lehigh Defense copper bullets, which are already drawing rave reviews from early harvest reports this year. So study-up on plastic sabots and where to buy them. I have 7-8 different plastic sabot containers, stuffed in an empty 8" high-tops work-boot shoebox in my basement. Part of this Ml'ing business is having all kinds of supplies to tweak our accuracy and ensure good ignition.
Link
Lehigh Control Fracture and Penetrator bullets