..two shortened .22's (17" barrels) both earn significantly higher energy heavier pellets. A 5mm 12" Talon SS (on co2) prefers heavier pellets. Might want to give something in the 14 - 14.3 gr. range a try (Cp's would be the long range choice, but the basic Benjamin black box clyndrical is worth a try).
Mr. Archer has the numbers...which seem about right to me. Something like 8-10% less for the short barrel, 5-7% for the reduction in caliber to .20.
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