Well, except the winner, Justin Welch... No additional plenum. If you are going to shoot .30 at optimum speeds, say 875 to 925 FPS, there is no need to add a plenum or any other power upgrades for that matter. If you are going to shoot heavy slugs at higher speeds, or if you're a science denier, and want to shoot the .30 pellets at over 1000 FPS, that would be the reason to upgrade the power potential... But for accurate best BC speed pellets, no reason.
Hi. When you say "optimum speed. say 875 to 925 FPS", is this the speed needed for the lightest .25 cal slug to shoot accurately (no human error)? Say 33.9 grain neilsen slug? I have an impact x .25 cal 600mm barrel out of the box and i want to buy just the liner for the slug. I have the same question with the OP. Thank you.
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