Preventing barn roof holes from happening.

Yeah I know!~ Don't miss! On normal, regular metal roofing used on barns and houses, how do you tame a .25 shooting JSB 24 grain pellets from going through a metal roof. Do I lower the regualted pressure way down, like 80 bar and make a light hammer spring strike? I would think some of you readers know about that and I would happily use your information as a teaching moment. Most of the in barn stuff will never be farther than 25 yards and most will be done in about 30-40 feet. Is there a stated FPE that one should not exceed to insure no hole punching. I realize that's not a guarantee as some roofs may be older and have rust etc.

I am going to get one of the FX Dreamlines in the near future and maybe I should just get a caliber other than .25. or an extra barrel set up, in .22 or .175. What would be the optimum caliber one could use to drastically reduce the probability of a through hole? Thanks!
 
Dude you should ask the dude that has the edgun leshey channel on youtube. I am blanking on the name of the guy but he lowers the fpe to 15 fpe and kills squirrels and skunks and stuff. All of the energy dumps into the animal and they die quick. Like instantly. Try 13 to 15 fpe but honestly I would use a 177. Even a cheap pumper from Walmart will be fine. 
 
Imo best bet is to go with a 22 caliber in the 15 to 20 fpe with polymags as was stated in prior post they tend to not pass through. I landed my first farm permission and currently use a 22 caliber pushing 20 fpe for the super close quarters like the barns and full 32 fpe everywhere else . As well I never use domed pellets indoors as they pass through.
 
I am going to get one of the FX Dreamlines in the near future and maybe I should just get a caliber other than .25. or an extra barrel set up, in .22 or .175. What would be the optimum caliber one could use to drastically reduce the probability of a through hole? Thanks!

A Dreamline .25 on low shooting with H&N 20g is right at 20 fpe.


 
Read ther above! Thanks for the help! I was piqued by the video above. Heard the man say using white light ala bright LED blinds the pigeons and thus prevents them from flying out into the night. Bonus! Also said the pigeons can see the infra red thus negating night vision devices. Anything I could find on line about pigeons says they cannot see infrared. I would like nothing better than to strap a white LED torch (for our British neighbors) to the rifle and be able to use the existing scope. I use an ATN Xsight and noticed the video screen does screw up the ability to see clearly when not using the scope. However, the brightness adjustment for the screen is set low so I have not experienced the effects the next day as he described.

I do have some Polymags I'll try on my targets and see how much my gun(s) like them. Leaning over the hood of the truck I can pretty much count on either my Veteran shorty or my WCII hitting where I want at 75 yds using the JSBs. I'll shoot some at my scrap tin and see what happens. I do need to learn what I need to do to get the FPS adjusted so I can get down to about what BobO says will prevent punch throughs. It may be logical to many but I don't know how to start doing that. Thanks.
 
In my low power tune 12 to 16 fpe is fine I like heavier ammo It is better hits harder , I use .22 or .25 , if you have a ,25 tune it down and sight in , WHat gun do you have ?

I use my leshiy .AA and other guns and FX at low and hi powers most guns just turn down reg settings and adjust HST . and have fun it is a whole new way of hunting ,

When I first did it with my leshiy I put in a sub 12 regulator and put my atn thermal and went out it was so fun hunting with a low power silent gun , as I am usually a hi power slug shooter , since then I have liked it so much I did lower aa few fx and airarms and crickets ,and go back and forth with tunes , I really found many of higer power pcp guns preform very well low power have fun LOU
 
Hi Jim81,

Just some tin penetration info shooting my FX Dreamline Walnut Classic .22 on "1" or low power. At 25 yards, I can shoot through 1 side of a steel rattle can with Crossman 14.3gr HP's. It will only go through the bottom of the can about 1 in 4 shots. Accuracy is pretty good for me as I can put 18 shots in a 1/2" circle resting the gun. 60-80 shots on regulator.

Enjoy,

Nugria