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Need help: Impact superior standar vs heavy JSB 18.13g or RD 25.39g

Hello, I am very excited about the BR50 (50 meters here), I have been practicing it for two years and have had positive but not consistent results.
Now I have a FX Impact compact MK2 with pp with three barrel options.
500 mm superior standard, 600 mm superior standard and 500 mm superior heavy, in pellets JSB of 18.13g and RD of 25.39g.

My question is which one do I use and at what speed? I have tried the superior standard of 500mm with the RD 25.39g at 850 fps with good results, but it is not consistent.
What should be my starting point?
Thanks

Jorge
 
18’s might work fine in perfect windless conditions but as the wind picks up they can be blown off course further than a heavier pellet with a higher BC. You might try working your way up in speed with the MRD’s from 850 to 950 in 20 FPS increments to see if you can find a sweet spot your rifle likes. You could also run some simulations in Streloc Pro to give a narrower window for optimal calculated accuracy?
 
Great results with the superior standar 600mm barrel and the JSB redesigned 25.39g!

Reg 140 bares, trigger 17 mm, FV 7 mm

std dev: 3.8

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