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What's the difference between Black Hills 5.56x45mm NATO Ammo 77 Grain Open Tip Match and Black Hills MK262 MOD 1-C?

For the .224 Aeromatch bullets we make cannelured and non-cannelured versions of 69 and 77gr. That is all. Published G1 BC's are always to be taken with a grain of salt. .355 vs .361 is within external factor variation (i.e. what barrel they're shot out of or what powder is used even).
What is the yaw characteristic and terminal velocity required for fragmentation of the .224 77gr Aero?

D.O.P.E change with electronic target?

They do not reface the target regularly. So, to preserve the rings that shooters use as aiming points, they offset the e-target so that impact is either above or below the point of aim.

We routinely offset the 'center' of our club e-targets by 900mm in the vertical axis, or roughly 1.5 moa @ 600yds. At most halfway serious mid-range F-class matches, the X/10 ring would be a ragged hole with no center left to aim at within one relay, maybe two max (if it's windy). At 300yds, for sure.

The whole point of e-targets is get people out of the pits down range, so there's literally no one down there to re-face the targets between relays. We often go an entire season without putting new centers on the targets - no one cares about that gaping hole up in the 8 ring 😉

When shooting F-class, at least in South Africa, you have 2 sighting shots.

There's matches with two 'convertible' sighters, two non-convertible sighters, and matches with 'unlimited' sighters (sadly, more common than they should be in my opinion).

These are used to "calibrate" your scope for the target, i.e. adjust your zero.

Some people use them to foul the barrel, some use them to adjust their dope for a new (to them) range, but ideally the best use (assuming you've shot enough that you have notes on the first two) is to explore the wind conditions ie if it looks like 'this', and I dial/hold like 'that'... how far does it *actually* move the bullet. Different ranges have different flags, differe6 mirage, and different terrain in between the firing line and the target, all of which make the wind effects slightly different for otherwise apparently similar conditions.
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