I have an AR500 10” gong which is about .5” thick. Was advised not to shoot it at less than 200m, or 300m with magnum chamberings. I guess your thinner AR450 would prefer 300m or more. As you have it, try it and see. If no good just get an AR500 and be done with it. I think I paid US$50 for mine when living over there. NZ rort will likely at least treble that for you.
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