MuleHunter,
I think we're on the same wave length.
If I recall correctly Matrix meplat is 0.60". That's huge in my book!
Again from recollection, bigngreen posted bc @ a mid 0.6xx value from drop chart development.
As Matrix informed me that their bullets won't perform out of my 270 Allen Magnum, and no other high bc bullets are available I've had to do innovation. Long, hard, expensive innovation.
Pursued trimming and repointing as you have. Learned of the same constraints.
Noted rifle smith/machinist (Sponsor here) could make a pointer but wouldn't due to patent/legal or some other potential issue of that type.
After going through 169.5 and heavier high bc 277 offerings I've firmly decided that, for extreme long range game taking, any/even extreme 277 offering is acceptable for deer and smaller game only.
I did a bunch of thinking when I was shooting 169.5 277s @ 3400 and the shooter was shooting 200 gr 7MMs in the same velocity range with a decent bull in the scope at about 1475 yards. I felt a bit under gunned.
My requirement is that the 277 bullet be high bc and hold together in a 3 groove 8 twist 30" barrel. By high bc I'm thinking anything greater than 0.600
When balancing velocity, bc and bullet integrity (no greater bearing surface than absolutely necessary) and bullet length (stability consideration) optimum bullet weight seems to hover around 160 grains.
Developing a bullet capability around these parameters gives one the opportunity to experience way more than one ever thought necessary. I gained great respect for names such as Berger, Hornady, Nosler. I had to opportunity to visit with a fellow that was with Nosler when he was still doing one-off bullets. Very interesting discussion.
What I came up with is a repointing method where a Nosler bullet is retipped with a brass point that increases bullet weight by nearly 10 grains and bc by at somewhere around 0.16 for the 160 class end product. Meplat is less than 0.30" and a uniform as a lathe can make.
I've shot them in rough prototype configurations with good accuracy and terminal performance.
A couple of fellas here have some for field testing several cartridges. I haven't been in a position for over a year where I can shoot and have until next spring to go.
We'll see what the field tests show and go from there.
I wish you well on your quest.
