9mm fps spike or not?

Lead hammer

CGN Ultra frequent flyer
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Saskatoon
Just working up a load.
Shadow, 3.4 N320, Zero 125 JHP-c, CCI small primer. 1.080 OAL = 925fps
Same as above but 3.6 grains = 1250 fps? Only shot 2 as factory loads were 1150.
Is that .2 grain difference normally that different? Looks like I will try 3.5 grains.
 
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