Airgun World - - Poi Shift -

PCPs are af­fected by am­bi­ent tem­per­a­ture, as I found when I ac­cli­ma­tised a ri­fle to 20C and 39C, charged it at each tem­per­a­ture to 170 BAR, and shot a string of ten pel­lets at each tem­per­a­ture. The re­sult can be seen in the il­lus­tra­tion ‘PCPs and tem­per­a­ture’.

With a 30-yard zero, the ex­tra 17fps of the pel­lets shot at 39C would raise the pel­let POI at 45 yards by just 3mm, so whilst PCPs are af­fected by tem­per­a­ture, the ef­fect on POI is the mer­est frac­tion of that of spring/ pis­ton air­guns.

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