I had the same issue with my S&W 469, the 124MPR at the ogive was just too wide not to hit the lands. The slide would not go into battery. My solution was to use a powder that sat the bullet deeper into the case. I found that Hodgon HS-6 at 6.8 grains sat the bullet for a 1.090\” OAL (published data). I posted a YouTube video on the gun and reloading for it, start at 14.26 where I talk about the 124MPR reloading:
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We are still working on backorders from the Independence Day sale. We are producing bullets as fast as we possibly can and so far it is going well. We are making great progress and many products are now back on the shelf!