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Old 4th November 2014, 06:24 PM
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Brian.Samson Brian.Samson is offline
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Join Date: Jun 2009
Member of: Pontefract, Doncaster Airgun Range
Location: Doncaster
Posts: 2,332

Of course, you're assuming that the BC for both pellets is the quoted average BC for that pellet in your gun.

There are around 50 different die's of JSB Exact 8.4's in 3 different quoted head size - some perform much better than others, I don't know how many die's of 10.3 or how many head sizes they come in?

For an example - I have a batch of 8.4's that give a BC of 0.0265 in my rifle at 50m (measured with a chrono)

Try your comparison again, but this time - compare an 8.4 pellet with better than average BC against an 10.3 with worse than average BC.

Of course, if you can find a batch of 10.3's that give a better than their quoted average BC in your barrel and they group well and remain stable in flight out to 50m then I think you're onto something.

But that might be part of the reason - it's easier to find a better than average 8.4 than it is to find a better than average 10.3

There's an added complication for spring guns too - the fine balance between slam/bounce and pellet weight/fit
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