In 2018 , I spent over a month working up a comp load for the Sierra 175gr TMK . Felt like I was , "Good to Go" for the SWN . No issues through over 300 test rounds , and my scores came up into the 190's . Decent for a then new F-class Marksman . The one thing I had never done was test-fire as though shooting a full string plus sighters in comp time limit . I should have !
Sighters ...10 , X , 10 , 9 , X , .. Going for record !
#1 10
#2 X
#3 -

#4 -

#5 -

#6 -

Two more 9's in the string , and I shot a 158 - 11x .
My scorer , and the scorer in the next position both told me they watched the bullets go poof about halfway to the target . It was very apparent ; that had I tested for shooting a string on time-frame , I'd have known that my rifle did not like these bullets with a hot barrel , because under normal firings , this issue never showed up . I don't blame the bullet . I blame Me , for not doing due diligence . Some bullets just don't work in some rifles , under certain conditions .
But the shooter next to me was sitting clean on his 17th shot , and had a blow-up on his 18th and 19th shots , which cost him any chance to win . I know it happened , because I saw it through my scope . You couldn't have missed it . A flash , and a small cloud of puff smoke . And the gentleman is a HM , and was shooting the ELD-M . "F" class is a different animal , so know what you're trying to do with the products you chose . And test for all conditions . For the record , I shoot nothing but Berger Bullets in competition now .