A buddy of mine gave me some Beck 5.56 ammo loaded with 77 grain Sierra OTM bullets.
Right on the box it said that a 1-7 twist barrel was necessary to stabilize it. Common sense also told me it would take a faster twist than 1-9 to do it.
So I decided to try it anyway. Below you will see the results.
200 Yard group and measurements.
300 Yard hits. (three shot group)
500 Yard Groups and measurements. This group was also perfectly centered in the target which was an 18×18 plate.
The rifle has a factory Bushmaster upper with 1-9 twist barrel, Stiller Predator lower, Timney trigger with a Huskemaw 1-6 scope.
Temp was 70 degrees and about 500 foot elevation.
The 55 grain bullet turret that the scope is dialed in with was also used and matched drop out to five hundred yards perfectly. However at seven hundred the 77 grain bullets were much flatter.
This isn’t a long range sniper rifle, but being able to engage targets out to five hundred yards quickly and with this much precision is good enough for me.
I also went through the entire session twice to make sure the accuracy wasn’t a fluke. Results were almost exactly the same.
Moral of the story?? Just because “they” say it don’t make it true. As long as it’s safe try a bit of experimentation. I regularly find stuff out about these things that surprise me.