Air Venturi PCP setup for iguana problem

The lower the FPS the faster the pellet drops. The more hold over, the harder the shots. Yes, you can holdover but why not have a flat tragectory to start? Why make it harder than it needs to be? FWIW, this isn't competition, 925fps is accurate enough. If it's a head shot, how much FPE is needed for a pass through at your distance? Why use more fpe than needed? Why not have flat? Don't get caught up in larger bore is better. It gives you more fpe but these are iguana's not coyotes.

All JSB using Hardairmagazines's BC
.177 8.4g 925 fps at 25 yards 11.54 fpe, 1.42" drop at 25 yards
.177 13.4g 925fps at 25 yards 23.1 fpe, 1.31" drop at 25 yards
.22 18g 880 fps at 25 yards 25.9 fpe, 1.49" drop at 25 yards
.25 25g 600 fps at 25 yards 16.96 fpe 3.19" drop at 25 yards


He already bought a .25 air rifle and scope clicks negate drop concerns. OP also mentioned a coyote problem which typically would lend itself to a larger caliber, as you have pointed out.
 
I have a GAMO Swarm Magnum pro 3i. It’s in .22 Cal. Works fine with Iguana’s. Using Hornet H&N pellets, generates about 930 FPS And about 28 Ft LBs. More that enough power to take down Iguana’s although the larger ones do require a neck or head shot to fall asleep. Otherwise a follow-up shot works fine. The Hornets are a 16 grain pellet. I may experiment with some 18 - 20 grains pellets for more stopping power on the big boys. But really not a big priority. Note: the Magnum requires about 50lbs of cocking pressure. So only recommended for the fit. Thought of switching to PCP, but love the fact that getting air isn’t an issue With the GAMO. Down the road, I may get an entry level PCP like the Gaunlet or Avenger, to play around with, and keep the Magnum as a solid backup, because it’s a really nice pump action rifle.
 
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I’m not an expert, but I think that with the power of the Magnum and a heavier 22 Cal, Pellet, 20 grain, or so, you can even experiment with slugs, which I understand the Magnum handles well, you can still generate approx. 800 plus FTS, That’s getting somewhat close to the power of a 25 Cal, without having to worry about flyers hitting the neighbors.
 
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Hey @floridaman , fellow South Florida guy here. Accuracy/shot placement on iguanas is WAY more important than pellet type. Just figure out what round your rifle shoots accurately and hit them behind the ear or behind the eye. There's some diagrams here: https://www.airgunnation.com/threads/iguana-minimum-acceptable-caliber-fpe-kill-zone.1273193/

For .25 cal the JSB 25.39 is a good place to start. And don't worry about lead in the yard - if you're missing the trap completely you have bigger problems! AIso, you shouldn't be zeroing with one type of ammo then hunting with another, your point of impact will be different. I use an extra small home depo box filled with rubber mulch and staple a target to the front with a staple gun. No pellets escape the box.
 
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The lower the FPS the faster the pellet drops. The more hold over, the harder the shots. Yes, you can holdover but why not have a flat tragectory to start? Why make it harder than it needs to be? FWIW, this isn't competition, 925fps is accurate enough. If it's a head shot, how much FPE is needed for a pass through at your distance? Why use more fpe than needed? Why not have flat? Don't get caught up in larger bore is better. It gives you more fpe but these are iguana's not coyotes.

All JSB using Hardairmagazines's BC
.177 8.4g 925 fps at 25 yards 11.54 fpe, 1.42" drop at 25 yards
.177 13.4g 925fps at 25 yards 23.1 fpe, 1.31" drop at 25 yards
.22 18g 880 fps at 25 yards 25.9 fpe, 1.49" drop at 25 yards
.25 25g 600 fps at 25 yards 16.96 fpe 3.19" drop at 25 yards

I agree, professional Iguana hunters rarely use anything larger than a .22. At 40yards and under an adjustable power PCP would be perfect for the job of killing iguana. set up targets at the distances you will be shooting and learn your hold overs/unders. PCP's aren't toys and can do serious damage to persons, animals, and property. Have fun, be safe.
 
Why is that?
Several reasons, first and foremost is that they operate in suburban areas and often shoot iguanas in trees, and over-penetration or missed shots violate rule 4 and pose a potential risk to people. They often use compact 22 air rifles that are easy to carry around a property, tuned to like 700 fps. Check out iguanas snipers on YouTube
 
Several reasons, first and foremost is that they operate in suburban areas and often shoot iguanas in trees, and over-penetration or missed shots violate rule 4 and pose a potential risk to people. They often use compact 22 air rifles that are easy to carry around a property, tuned to like 700 fps. Check out iguanas snipers on YouTube
Interesting, here I would have thought a slow moving .25 would be a viable solution for overpenetration as the drag after impact would be greater. I'd have also guessed that .177 going around 6-8fpe would be good for baby / juvenile iguana. Learn something new everyday!
 
Interesting, here I would have thought a slow moving .25 would be a viable solution for overpenetration as the drag after impact would be greater. I'd have also guessed that .177 going around 6-8fpe would be good for baby / juvenile iguana. Learn something new everyday!
you could kill them by pinching with your fore finger and your thumb if you could catch them, they aren't armored, or hard like an alligator