FYI, I have used different Sig mini and bino models for more than 10 years and they have served me well. Also recommended them to friends who use them successfully.
I have learned a few things on forums, with others and in the field.
First, determine exactly where the laser lands in the reticle. Each rangefinder is different. Find the vertical and horizontal edges. Some lasers are oval shape. Laser a hard edge like a building until you know the exactly...
I have never used one, but I see reports that they are not as accurate as the ones I mentioned.
If I don’t have velocity from a chronograph, I start with box velocity and it’s usually close enough to get my ballistic calculator on.
If you look at Snipers Hide, it used to be called Weaponized...
Which chronograph?
I ran Magnetospeed and Labradar next to each other and they were off maybe 15% off the time and at most by 2 mph.
I ran Magnetospeed and Garmin and same thing.
If sitting, you don't need a tall one, so you can get a more sturdy one without the center column. I don't like the center column cause it pokes down in between your legs and if you put it up it is much more wobbly.
I try to get the least number of leg sections as possible, it makes it more...
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Look at 6.5 x 284 if you rebarrel the 06. Or, a 25-06 with fast twist for the 133 Berger or Hornady.
You don’t need the 280ai, but if you go that route a 20” barrel will work. You can get much more velocity with a smaller caliber.
So many asterisks for box velocity... but, yeah, I am sure that they fudge the velocity. Frankly, box velocity is one of the many things that I view with a hefty dose of skepticism.