Benjamin Very Heavy Pellets in the PRod @ 20 Yards

Someone left some 28.5 grain Dae Sung pellets at the range the other day. I think they are for the Korean PCP rifle. I did not try it but I think they are too long for PRod magazine. I have a single shot tray. I shot 18.13 and 14.3 at the same time with the same point of aim. The 28.5 pellets are a wee bit tight loading in the PRod. I think they would be good rat killers..

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As heavy as they are and as long as they are, there is no way they could be stable beyond 30 yards or so.
More speed and a faster twist would be required.
Of course at 30 yards the speed will be below 400fps..
What was your range for those groups? It seems like there would be a lot more drop with the heavier pellets. Those JSB Jumbo’s look real good.