Most likelymmp sabot is the MMP HPH12's or MMP short/regwith a loaded diameter of .507" -.508". So if to tight for your bore the options with MMP(my preference when it comes to sabots) are as follows:

HPH24 loaded diameter: .505" - 506"
3P -EZ loaded diameter:.502" - .504"

I have a savage with a tad tighter bore and MMPHPH24's make the difference for me. I have not tried the 3p-EZ's but the Harvester CrushedRibs proved toomuchand according to my mic they would be similar to that of the 3p-EZ in loaded diameter. FWIW a couple buddies with tight TC's also found relief in the HPH24's vs 12's.

In the case of the XTPwith use inthe mag sabots, I have clipped them down (using a toenail clipper) basically creating a short/reg sabot.This can prevent the jag from gripping the sabot and ease loading as well. I have not found any accuracy returns from doing itnor have I seen negative effectson performance. IME it is strictly a loading effort fix and a last resort. In my savage it basically allowed me touse HPH 12's for testing, though being it can bepretty cold it wasn't ideal for my hunting applications so I found a better fitting sabot.

Good luck