H&N Grizzly .25 Cal

My experiences so far, indicate the accuracy problem is pellet/slug sizing. In the newer FX barrels the twist commences from the get go. In an older barresl the smooth internal acts like a resizing die, by the time the pellet gets to the twist it is the correct size for the twist to be effective.

With FX Impact X barrel the twist starts at the initial stage of propulsion, thus the pellet tends to need resizing at the same time it has to start rotating. I believe this is where my problem lies, with .22 Rabbit Magnum II pellets are heavier and thus longer further forward in the chamber than the .22 JSB Match pellets recommended by FX. The heavier Rabbit Magnum II spray at 23m, 75mm spread. Same pellet in my Evanix S10, one hole group.

An interesting journey, I've purchased a pre-X .25 barrel and with the JSB 33.95gr pellets obtaining one hole group at 23m, 115bar, 800fps, with 48.24ft/lbs,10 fps spread.


 
I have a tin of .25 Grizzlys that's nearly full minus 5 rounds. If someone wants them, PM me.

I use it perfectly in my warp cobra de jim. 100m works better for me than the NSA. You can write me to my instagram to give you my address. @airgunplus
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