OK Ballistics - Thats D.O.P.E. - Oklahoma Gun Forum
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Long range shooting
- Thread starter Kwaynem
- Start date
It's a decent write up, but they plug a couple things that are irrelevant or can be questioned.
Their bulletized list for inputs for a good ballistic calculation:
I will add that DA should be in the list. You can go live or lock it. Best practices are to lock your environmentals and make a 3000ft DA for general all around ballistic solutions or lock it at the altitude you are. This is if you're using a Kestral or another ballistic calculator that has environmentals on it.
An accurate zero is super important. Make it as close to the center elevation wise as possible. It will show up at long range.
His comments on truing BC are questionable IMO. A lot of long range shooters, especially on the mil side would disregard that, because MV is what's trued. What he describes is "truing" your gun with a change in MV. Now with the Garmin, the whole truing aspect is almost moot. You can find out what the BCs of bullets are, but his blurb on it is a function of velocity, not really BC.
WRT their BC table of projectiles, I can leave the BC as is, and change MV and get the same results. Go read Litz. Truing is done as close to transonic as possible, not 400 or 600 yds/m. 800 is good for 308. Note, AJ only happens in the first 100m of flight unless there a super windgust downrange. It gets turned off in the Kestrel because it will give you an incorrect solution.
This is where your zero comes into play, The more accurate your zero, the more accurate your truing is. I have seen time and again, dudes true their guns and end up with a jacked weird MV, then hit the Garmin (or an Oehler ot Magnetospeed) and it's way off. The Garmin don't lie. They get told to check zero and it's almost always a little high or a little low. When people zero, they learn or are told it's GTG if they're impacts are in the little 1" circle/square the POA fall in. You want to get your group as close to the POA as possible. If you're only shooting 500m or so, then it doesn't really matter.
Their bulletized list for inputs for a good ballistic calculation:
- Velocity
- Scope Bore Height This has the least to do with anything regarding you're bullet impact. The error measured is smaller than the bullet diameter. It's akin to sweating coriolis at 500m - moot.
- Bullet Weight & Length
- Twist Rate
- Zero Distance
- Scope Value (MOA or MILL) Mil
- Where TF is BC?????
I will add that DA should be in the list. You can go live or lock it. Best practices are to lock your environmentals and make a 3000ft DA for general all around ballistic solutions or lock it at the altitude you are. This is if you're using a Kestral or another ballistic calculator that has environmentals on it.
An accurate zero is super important. Make it as close to the center elevation wise as possible. It will show up at long range.
His comments on truing BC are questionable IMO. A lot of long range shooters, especially on the mil side would disregard that, because MV is what's trued. What he describes is "truing" your gun with a change in MV. Now with the Garmin, the whole truing aspect is almost moot. You can find out what the BCs of bullets are, but his blurb on it is a function of velocity, not really BC.
WRT their BC table of projectiles, I can leave the BC as is, and change MV and get the same results. Go read Litz. Truing is done as close to transonic as possible, not 400 or 600 yds/m. 800 is good for 308. Note, AJ only happens in the first 100m of flight unless there a super windgust downrange. It gets turned off in the Kestrel because it will give you an incorrect solution.
This is where your zero comes into play, The more accurate your zero, the more accurate your truing is. I have seen time and again, dudes true their guns and end up with a jacked weird MV, then hit the Garmin (or an Oehler ot Magnetospeed) and it's way off. The Garmin don't lie. They get told to check zero and it's almost always a little high or a little low. When people zero, they learn or are told it's GTG if they're impacts are in the little 1" circle/square the POA fall in. You want to get your group as close to the POA as possible. If you're only shooting 500m or so, then it doesn't really matter.
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