This might be true with PCPs. Heavy 177 pellets will never be as efficient in springers as 20 caliber. It's not the weight as much as the surface area the limited amount of air has to push on. A 177 springer will make at least two, maybe three fpe less with a 13+grain heavy pellet than the same EXACT springer with a 13+ gr 20 caliber pellet.Plenty of shooters still value .20 but the arrival of heavy .177 sort of killed off the big sales of .20 which peaked in the 90s.
Now that 10 to 15 grain .177 are available…and even up to 21 grains in slugs ….you can have efficient ballistic coef with deep penetration ..also a much greater choice of .177 in the store.
My old .20 Sheridan still my favourite gun for all tha…
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