My brothers desert Big horn was only 450 yds. but the recovered bullet (160 gr accubond) was a perfect mushroom just as his sons was at 820yds on a cow elk. I must confess at this point I had my own experience last fall with an accubond. first let me digress ,I applied for 13 hunt's in 5 western states last year and went 0-13 I could not even draw a general season deer tag, so me and my nephew bought Wyoming antelope
doe tags (oh the shame) but to make it sporting we decided to shoot them at 1000yds. O.K. I fell short and shot mine at 950yds with my 300WM and 180gr Accubond because some jackass shot and wounded this poor animal earlier in the day and I did not want it to suffer. the accubond (180gr 300WM)still mushroomed and woorked well.
think I am BS'ing we have it on video. Not hollywood but entertaining.