No disrespect, but please read my post again, I did not say bore riders are inaccurate, I said how they fit the bore dimensions determines the accuracy we can expect to get from the bullet. If a bore rider design does not fit ridde on the lands preferably be engraved by them, then the faster a such a bullet is shot, the worse it's accuracy will be. Please note that I did write that if the rider fit the bore proper such designs are good bullets. I suspect that either that is a lower velocity load (not greater than 1400 fps) or that the bore rider fits your rifle properly, or both.
Again, I'm not sure of your intent, I can assure you that all I was seeking to do was share how to check the bullet against his barrel without firing a shot. If the bore rider is loose in the bore it will most likely not shoot well at greater than 1200 fps. This is a very common phenonemon with cast bullets regardless of caliber.
I apologize if I misread your intenet and felt I had to defend myself. Please be assured that my response is meant as nothing more than a clarification of my post.
Nice group by the way. :grin: