So BC testing was a little disappointing. Based on my tests I come up with a .033 BC for the JTS 18gr and a .038 for the JSB 20.83gr. My Vet1 was shooting at 900fps average which makes sense being much colder now than when I set it up in the summer last year. My Vet2 at 920fps. Was hoping to be in the mid .04s but is what it is. It is a 15% increase in BC which for the 15% increase in weight makes sense. I guess if I really want the higher BC I need to go to the 25.4gr. Not sure i really want to though. Guess it wouldnt hurt to try.
I measured a bit better BC with the .22/20.83 than you're seeing but that was from a 1:30 polygonal rifled barrel. The slower twist poly barrels can pretty well be trusted to like higher speeds than a 12 land and groove like your Vet. And a poly profile usually gives a bit better BC than a 12 land and groove too. I remember that youre Washington/Oregon? area, and if at low elevation you'll be losing some BC due to elevation too, compared to my mile high conditions.
But as stated by Bobby, the .20/15.89s simply cannot be beat for BC when the criteria is pellets and less than about 40fpe. I I used the .20/15.89s from the Ghost to place in the money at EBR American Field target a few years ago, against guys shooting .22s at almost double the fpe. I've got some YouTube videos of using a bog standard .20 Condor and whacking prairie dogs out to 125+ yards with the JSB .20/15.89.
Your most recent post shows the Vet 2 really liking the .22/20.83s, and as I stated in my little BC and initial impressions post a while back, and as you found, those .22/20.83s are an improvement in BC over the .22/18s. I've never considered the .22/18s to be any sort of valid long range option if there's much wind at all. They're a great midrange option, and were bout the best we had for a long time for this power level, but for perspective, the BC of the .22/18.13 is about what I get out of .177/10.34s at 19fpe from my USFT for field target.
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