Sabots and really hard bullets like brass or even copper over 200gr can be problematic with smokeless. Bullets like the 200gr SST and Barnes 195gr BX are a bit easier to get to shoot even at 2700+ fps. Barnes had a couple runs of bad BXs though and even they would drill sabots.
Get the Harvester sabots called light blue smooth. Crushribs might also work.
4198 is ok for sabots upto around 60gr but after that it will blow sabots occasionally if you are not careful about barrel temps..Sabots HATE a hot barrel...Even warm to the touch can be too hot.
N120 is also pretty good upto around 60gr and produces excellent speed too. Over 2700fps iirc for that amount.
Reloder7 is probably one of the easiest powders on sabots. Its fps per psi is very good. Re7 is dirty though and you might need some swabbing. Ive shot upto 63gr of it with sabots and thats far from max.
Be aware that these are with a 209 primer and your LRMP may produce slightly higher velocity and pressures. Even changing from a Barnes 195gr to a 200gr SST can yield higher numbers.
Another thing to consider is how temps effect velocity and peak pressure.
