I have just tried to load the Elvis 77 by Arsenal molds in A ar15 1 in 9 twist . I want them to cycle the action reliably. 1st attempt was at around 1800 fps in a 1 in 9 twist barrel so i would expect 144,000 rpm . bullets were not stable at 75 yds and only 2 out of five were on the target . If i went to a 1 in 7 twist barrel to try and stabilize the 77 gr bullet I would be at 185,000 rpm . I have not tried them in this gun yet .
From what i have been reading 140,000 is about the fastest you can spin a cast bullet. If you check a copper jacket at full power it is around 252,000 rpm .
Has anyone had any luck with this bullet or is it to heavy to stabilize in a load that will cycle a Ar15
Is this somethig that will not work ?
I have loaded the 55gr lee bator with 3" groups at 100 yds and cycle all my ar rifles ok.
Bob Harrelson