Absolutely no idea. Barrel has had the throat pushed forward for heavies. I made a dummy round and just stuck the top of the boat tail at the neck shoulder junction, checked it chambered and extracted easily to confirm it wasn't jammed and left it at that.
Have not measured the amount of jump I'm giving to the 62's in either my 223 or 22-250. They don't seem to care. But if you are trying to control it, I would probably treat them like a Barnes and aim for about 50 thou jump to start off.
Resident 6.5 Grendel aficionado.
Then I loaded 4 Nitro for Black loads in two bullet weights for my 40-70 Sharps Straight Remington Hepburn
Two of each 255 and 335 grain bullets
IMR4198 40% loads
Both shot to the same place at 50m with open sights
Good easy NFB hunting loads
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