Tuning a .22 Marauder for JSB Exact Heavy pellets

[Saltlake58]

Does anyone have a tune for the Gen 2 Marauder, .22 Caliber, shooting the JSB Exact Heavy 18.3 grain pellets at about 830FPS? Just wondering what tune other people are using, and shots per fill on the standard 215cc fill.

Many thanks for any help

 

[Alan]

I can tell you one way to do it. 

Install a Marauder .25 caliber transfer port, and install a TSS. That is all I did, and with the TSS adjusted at its minimum setting, the 18.3 sail along at 925 FPS. That's ≈35 FPE. 

 

[Saltlake58]

Thanks for the response. I'm not intending on spending anything on the gun at present. Saving for another gun, and close to the price point.

​I'll start with the transfer port though. The TSS might be too much. Right now, transfer port is set to 2 revolutions open, and it can go a lot further. The 18.3's currently fire at about 750, and the goal is 830, so not that far off. Transfer port is a good starting point.