Hi in the air gun world " F X " company do have some of their barrels done this way [smooth then a twist @ the end ]
they are rated rather highly ..
So when you reload do you still want to use the cup//wad and shoot under sized lead or go full bore with your projectile size
What brand of supp. are you using . I have a couple of different brands and do shoot solids via them ,but i tend to use subsonic loads because of the noise of the H Vel. One barrel is even ported to slow regular ammo down Cheers
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