It's hard to win at this. Bullets with two cannelures are not always a good solution either. Many of the two cannelure bullets have the second one too close to the bullet heel. Trying to crimp into it can sometimes cause the heel to distort and that's the last place you want a bullet to distort as its the last part of the bullet to touch the bore. Second issue is along the same lines, but more to the fact that only seating to bury the rear cannelure does not leave much bullet still in the case. Both can destabilize the bullet and effect accuracy.
I sincerely believe that the lack of tiny groups similar to the FTX family is due to the nature of FMJ's whether round or flat pointed. They're solid metal as opposed to the FTX's with their hollow points. Air weighting less than lead, a 230gr solid bullet will be considerably shorter than a 230gr bullet with a hollow point. Even a hollow point with a plastic ballistic tip in it. Shorter bullets leave less opportunity to experiment with different seating depths. I personally prefer to have a seating depth of 1 caliber, but I've gone a shallow as 1/2 caliber. If you're doing the latter with heavier bullets, its not nearly as performance impacting as lighter bullets since the heavier bullets provide their own resistance to motion once fired, relying less upon the retentivity of the crimp. That's a double edged sword though as the heavier bullets pull more due to momentum when chambering. The exception being the 300gr XTP Mag bullet. If you load it to 2.25 COL, its blunt tip is already into the rifling when it is fully chambers, lessening the tendency for it to pull out further.
I have yet to load and experiment with the Flat Point FMJ's, so I can't say if they fare better for the amount of bearing surface available to seat into the case and subsequently crimp into. The weather got warm, then slid backwards the past couple of weeks. Cold, drizzly, diarrhea weather has ruled lately. At least we don't have drought to deal with.
Hoot