I dunno if you should use the heavy spring with yours though. Im kinda at a loss of why you are having such problems.
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Ok, ordered a spikes buffer like yours off ebay. $32.29 new shipped. Cheaper than dirt had it for $28, plus $15 shipping.
BTW, shooting it today I watched a round strike (what I believed was) a rock and watched the spark travel 20ft up in the air where I lost it in the branches of the trees. I guess it was the steel core getting split out and ricocheting upwards. I'd like to shoot some ballistic gel with it to see what it would do!
I can tell you visually the strikes it makes into the bank knock golf ball and larger sized holes out. .223 just typically makes a pencil sized entry. When I shoot again I'll take pics of it.
I'd rather be shot by .223 than 5.45. I know the .223 more or less wounds.