Otters/Champion .22/.17 HMR Bullet traps. I used 5 gal. buckets with rubber mulch for a long time. But now that I cast, I wanted easier lead recovery.My rainstorm would blow right thru the gamo trap. Knife
It won't take long to put a hole through that Gamo trap if you are shooting .25 cals at it with any power. It is really made for lower energy .177 pellets. I ahve one that I destroyed with .22 cal pellets . . . I have both rubber mulch and duct seal traps that I use. I always use the reubber mulch one for chrony testing when shooting close - if you keep hitting the same spot in a duct seal trap you will eventually dig a hole through the duct seal, and end up shooting into your backing plate (if you make either, do put a steel plate in the base to catch any that get to the bottom, as it will eventually happen).
Know how we're trying to pound pellets into a tiny little group?When we manage it, are pounding the devil out of a little section of pellet backstop. The ones with loose backing (like the tire-multch traps) kind of rearrange themselves....the thick steel backstops are too tough to give up (but loud). The pluber's putty type are generally thick enough to form a "ball" of mashed lead where the pellets are retained and clump up.But if you are using a"static" back stop and a powerful PCP (lets say anything from 50 foot pounds and up)...shooting a large shot group (like 10 or 20 shots on the same target in a nice tight cluser) can eat it's way though a double stack of bricks.
I had a rubber mulch trap several years ago and liked it mostly. Had used a plywood plate behind it and a couple sheets of pink foam insulation boards on the front. The *only* issue was having to retape the holes. Since then I've been using the Gamo traps with 2 layers of alum plating with duct seal ontop of each. The Gamos spend 24/7/365 outside, hold-up incredibly well, and largely blend-in with the wooded areas. No real drawbacks, but it's a very small target indoors when shooting strings. Looks like I'll be visiting Ace hardware to build another mulch trap this afternoon. Thanks for all the great feedback and recommendations.