Don't know the answer to that one but presume they will work as advertised as the manufactures carry out test to ensure they are OK. Recently I shot a sambar stag (neck shot) at 25 yards with my 300 Win Mag / 178 ELD X and it worked well , recovered the bullet mushroomed right back but still retaining the lead, and weighted 91 grains. So on the closer end of the scale they are reliable but have yet to get any long range data yet.
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