I dunno what .345 is, but a 22lr and 9mm pistol range is easier to accommodate than rifles.   Main thing is the downrange area is cleared for the maximum range of whatever your firing and you have an adequate backstop.  There's things that can mitigate the range issues like overhead baffles or shooting rifles through a  culvert pipe etc.

NRA has a range guide for purchase.

Rifle needed for pigs + distance. By .345 I meant ammo. For target practice, have backstop, will look into baffle and culvert pipe, not familiar with latter. Thank you.

It's been a LONG time since I was in the range planner/designer role.  1,300 ft isn't a lot without mitigation/barriers.  Even for .22 lr.  Dunno what particular rifle calibers you were envisioning, but you're talking potentially mile(s).  I've had projects to design baffles (side and ceiling), backstops, bullet catches, etc.  Those stuff aren't cheap.  That said, depends on your site's topography.  If you need to dig/excavate an area, to form say a berm, be very careful on the site drainage.  I've seen some epic failures on that aspect.

Always mitigation barrier, have a backstop in place with at least 1,000ft of uninhabited land behind it. Super safe.

"I've seen some epic failures on that aspect" I bet! I've seen some myself, not related to shooting ranges, but just thoughtless excavation without taking topography into consideration. Because you know, mankind wants what it wants. Then nature teaches hard lessons 

I APPRECIATE EVERYONE'S INPUT - MAHALO!!! 

Good general information ....

Building A Backyard Range

Before you begin construction on your range, you will need to visit with your county planning department.
While there, thoroughly review your state and local laws and zoning ordinances as well as any potential
neighborhood covenants, codes, and restrictions that may be in place regarding the recreational use of
firearms on your property. You will also want to identify, if any, Environmental Protection Agency restrictions
on lead ammunition or regulatory requirements for reclamation of spent lead ammunition.

This is also a great time to discuss your construction plans with the planning department in the event that
you need to apply for permits or update your property site plan.

Additionally, you may consider having a conversation with the local code enforcement personnel to inform
them of your plans to construct a range on your property and that you have verified that it is legal and in
accordance with local zoning ordinances. This will help them manage neighbor complaints that they may
receive once your range is established and you start shooting.

The National Rifle Association has an online Range Development and Operations course that is designed
to educate people that are looking to build a public range or private range. The comprehensive course that
gives helpful information regarding environmental concerns along with indoor and outdoor range construction.
For a much lower price point, the NRA Range Source Book retails for $59.95 and has over 30 chapters that
will help you get started on your indoor or outdoor range.

https://www.gunsamerica.com/digest/building-a-backyard-range/

Find out what the Hawaii Island dispatchers' procedures are when they receive a 911 call reporting gunfire.  If they check their database, and your address is listed as having a range, the dispatcher may be able to let the caller know, and no officers will be dispatched.

If you've followed the news about ranges on the mainland, many anti-gunners have moved into areas with ranges only to do everything they can to have them shut down.  Noise is the #1 complaint used to cause gun ranges problems.

From Flapp’s quote:
You will also want to identify, if any, Environmental Protection Agency restrictions
on lead ammunition or regulatory requirements for reclamation of spent lead ammunition.

It was on my mind that if ever to re-sell the property would you have to do lead reclamation or disclose it to the buyer regarding lead.
I would think you would have to at least disclose it. Especially on AG land.

Loved shooting on my friends old ag land though. 

Gotcha! Yes, I've already reached out to the few who are most affected and asked. So far so good  .

"Heck, the neighbors might decide to have a beer since they're up anyway!"  Right?

If you have that sort of neighbors, all the better.  They can bring ammo and beer.   

Dang. I wanna be your neighbor. 
That’s cool that the neighbors are good with it so far.

Always mitigation barrier, have a backstop in place with at least 1,000ft of uninhabited land behind it. Super safe.

1,000ft and a berm aren't enough alone if there are buildings downrange.  9mm can go something like 4,000ft.

I'm all about alerting my closest neighbors, I think it's basic courtesy. Sound carries super far out here so it's impossible to alert everyone. Most closer neighbors are gun-friendly and shoot occasionally, either for pig management or just because. And no one sends out alerts. The problem always is the one or two who are super sensitive and no matter how nice we go about and communicate in advance, they are always in disapproval. It only takes that one neighbor to ruin it. And giving courtesy alert to the types only gives them the opportunity to call the cops in advance for them to show up in the act. It's a toughy  .

I'm at the very end of this thread.
You are BI so you know that bad neighbors will be invited to leave
and they eventually will leave.
Be they busy-bodies or Meth factories.
Lots of guys on this site are City centric. Consider this
BI is the size of Connecticut and only two hundred thousand people.
Most the cops can't even physically drive to our houses, much less find them
outside towns.
Discreetly check things out and go from there.
Fuk the law. for shooting, But only here. 
Oahu has too many pussies to get away with
that.
 

From Flapp’s quote:
You will also want to identify, if any, Environmental Protection Agency restrictions
on lead ammunition or regulatory requirements for reclamation of spent lead ammunition.

It was on my mind that if ever to re-sell the property would you have to do lead reclamation or disclose it to the buyer regarding lead.
I would think you would have to at least disclose it. Especially on AG land.
 

This is a good question for real estate agents, since selling a property in HI requires full disclosure, usually. In other states, the seller pays the buyer a fee/consideration (around $500) to waive that requirement. We wouldn't want to disclose dead bodies on the land, would we? 

In the Hunter Ed course and the state web site, it is mentioned that certain hunting areas border private property, and hunters need to get permission from the owner to enter that land. Wouldn't this pose a lead remediation problem, and why would an owner risk having to deal with such an issue?

Hunting is not a practice range. Hopefully your not putting thousands of rounds down range while hunting.
Unless it’s doves and birdshot.
And it’s just something to consider.
Been to couple of ranges set up on ag land on Oahu.
They are good fun.
One was the only place two of my kids would go shooting because informal and we could blow up all the apples, melons and strawberries we wanted. (Strawberries mounted on meat sticks.)
Reactive targets are awesome.
But then the pigs would come in later to grab the leftover debris.

This is a good question for real estate agents, since selling a property in HI requires full disclosure, usually. In other states, the seller pays the buyer a fee/consideration (around $500) to waive that requirement. We wouldn't want to disclose dead bodies on the land, would we? 

In the Hunter Ed course and the state web site, it is mentioned that certain hunting areas border private property, and hunters need to get permission from the owner to enter that land. Wouldn't this pose a lead remediation problem, and why would an owner risk having to deal with such an issue?

More of a volume issue.  A hunter might shoot a few rounds spread out over one trip, not a big deal.  A shooter practicing at the range could put hundreds of rounds in a small area in one session.  Private property owners are more concerned with injuries.

By the lot size you gave, it sounds like the lot sizes of most lots in FFVE where I live, except that my lot is about 266x490. I used to shoot all the time before COVID.  No one ever complained and cops take 45 minutes minimum to get out here.  I would keep my shooting sessions to no more than 50 shots and no longer than 30 minutes.  If I wanted to shoot more I would take a break for at least an hour.  Easy to do when you are just shooting in your backyard or in my case sometimes from my 2nd story deck.  I used to hear one guy shooting sometimes 200 rounds for an hour.  Don’t hear that anymore, probably because ammo is too expensive.  Nowadays if I shoot centerfire, it has to be to try and kill something, like a pig or mongoose.  I may on occasion shoot my 22LR at targets but only 10-20 rounds.  The only thing I like to keep in practice with is defensive handgun shooting.  Since I have a Glock G19, I bought a Umarex BB clone and use that to practice drawing from concealment and shooting at the man targets I bought at Front Sight from 3 to 7 yards.  Cheap practice at about a penny a shot and quiet.

1,000ft and a berm aren't enough alone if there are buildings downrange.  9mm can go something like 4,000ft.

Only if you are shooting above a horizontal plane.  My backstop is a 8 ft high by 12 ft wide by 10 ft thick pile of brush and logs from clearing the trees on my property. Behind it is 150 ft of densely forested ohia and guava trees 20 to 30 ft high.  After that is more of the same uninhabited densely forested land for 3/4 mile with no homes and then the highway.  I love where I live, where nobody cares what hell  you are doing and minds there own business.  Can’t say the same for most of Crylua where I used to live, except for the really good neighbors I had and knew well for 6 houses on both sides as well as the same amount across the street.  What really surprised me when I was living and working on Oahu is the amount of people who didn’t even know their next door neighbor.  On the BI my next door neighbor might be 200 yards away because of the lot size and vacant lots between us but I know them.