300 blackout ballistics

[diputs]

Not sure if this is the right forum to ask this but I will anyway....

If I zero for 110g at 100 yards going ~2400 fps. How low would 220g subsonics be at 25, 50, 75 and 100 yards without adjusting the zero on the scope.

[ExFlyinguy]

The math is too complex for me.....BUT maybe this will help

It's a super/sub 300BLK reticle for reference:

[zachomega]

The math is too complex for me.....BUT maybe this will help

It's a super/sub 300BLK reticle for reference:

That is a lot of drop.

-Zach

[Nate7667]

Yeah, it is lol
110gr at 2400ish fps vs a 220gr at 950-1000fps

Was that 2400fps your data or data from the ammo box?
If box data, have you confirmed it to be close?
Whats your barrel length, 8.5" or 16" or anywhere in between?
Couple hundred fps difference right out of the muzzle.

You can do the math, it should get you close.
Something like the 556, 308, 300wm, there has been years of data recorded and published.
The 300Blk, you may find some stuff digging around online. Best way to know 100%, go shoot it.

[diputs]

It's out of a 16" handi rifle. I have shot the subsonic out of it and am going to work up a load using 110 tac-tx. Most data I have seen is in the 2300 to 2400 fps for loads with them. My subsonics are shooting about 900 fps. I just changed scopes and sighted in at 100 yards but haven't chronoed the load yet. Guess I'll post results once I shoot and find the drop.

[Twoboxer]

Not sure if this is the right forum to ask this but I will anyway....

If I zero for 110g at 100 yards going ~2400 fps. How low would 220g subsonics be at 25, 50, 75 and 100 yards without adjusting the zero on the scope.

What is the muzzle velocity of the 220g?
Less important, what are the BCs of the two bullets?
Finally, are you worried about, say, 1/4" error?

[diputs]

The 220s are Sierra matchking.... just looking for minute of critter accuracy. The scope I have doesn't have target turrets and don't want to adjust the scope every time I change between sub and super

[zachomega]

The 220s are Sierra matchking.... just looking for minute of critter accuracy. The scope I have doesn't have target turrets and don't want to adjust the scope every time I change between sub and super

Not criticizing your motivation, but I feel like you are asking a lot from your scope out of two very different loads.

Maybe you should look into that 300blk reticle as shown above.

-Zach

[bortle]

If I recall correct I have a 6" drop from 50 to 100 yards with mine. I worried about having enough killing power for a deer.

[stack$99]

Check out the primary arms ACSS reticle for the 300BO. Inexpensive and works great for both my subs/supers. Although it does sound like your looking for more precision than one scope can offer with two drastically different rounds. Another options is just sight your scope for the round you are going to use the most and then put offset iron sights for the other round.