Do these work well in the Benjamin marauder?
Yes, typically very well
Has anyone tried these pellets in an Umarex Octane?
They shoot very good in my Umarex Octane and Ruger Air Magnum, no complaints. Woodys World.
Could be the pellet design, at 18.13 grains, should be shot from a magnum air gun, like the Octane, or PCP.
I use these with great success in my Ouctane. 1" groups at 30yrds. 1/2" - 3/4 when the old hands are steady...
I have. But because my Octane is so bad (can't be "Held") that pellet comp's (9) were meaningless. Ironically, the "Fuel" .17 and .22 are very good.
Will these JSB Jumbo Heavy .22 Cal/18.13 Grain Pellets Work in the Latest & Largest Girandoni .22 Air Rifle. Some Jumbo Pellets Will Not?
The same caliber as the pellet. Woodys World.
Do you know what the actual bore diameter on that gun is?
Is this U.S. Made
what is ballistic coefficient of these pellets
Look up: Straight Shooters Umarex Octane Velocity Tests on 34 different .177 and 27 different .22 calibers. Tested velocity at the muzzle, 10 yds, 25 yds, and 50 yds fps, ft lbs energy at each distance, and ballistic coefficiency. Pellets included PBA and lead. Get a chronograph. Woodys World.
JSB Jumbo Exact Heavy - 0.22 - 1.173grams (18.10 grains) (BC 0.027)
I believe that the Ballistic Coefficent of these pellets is .0330 (GA)