Nice review.... In .177 it's a good idea NOT to start fiddling with the ports in any way, the stock ports are plenty big enough for up to 800 fps, and in fact if you start hogging them out you are more likely to lose velocity than gain.... That doesn't apply in .22 cal, where going to 5/32" ports (including the barrel) will show gains.... You should NEVER drill out the barrel port in a .177 Crosman barrel, the 0.134" port is as big as you can go without causing loading problems anyway....
Bob
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