2250xt initial fps plus mod fps

[Geoff]

Stock at 70 degrees I shot 3 CPHP's and averaged 538 fps

I installed an 18" barrel, replacing the 14.5" one
I installed a extended stainless steel bolt probe and probe handle
I installed the crosmods endcap to allow larger co2 bottles or a ninja HPA tank

Average speeds at 68 degrees (basement getting colder) 563 fps

I added the LDC adapter / muzzle break on the end and fps jumped to 613


I was using a 12g cart to test the last 2 speeds.  I have found that the larger co2 tanks give a few more FPS over the 12g carts

I need to get my 12oz and 20oz co2 tanks filled in order to test with the larger tanks to see if speeds bump a little as has been my experience.

Once I do that my next step is to get a ninja type tank, regulated to 850-1000 psi and test the speeds.

[BigTinBoat]

Good to see you got the adapter.

Not sure why the jump with the LDC, that shouldn't change anything.

My 2250XT has a 9oz bottle and I am getting an average of 610FPS with 14.3CPHP at about 85 degrees. My valve is enlarged a bit and the TP is poly tube. Barrel is 14.5"
I have a bottle set at about 950PSI (iirc) and it is getting 625FPS with the same pellets.
I wanted to set the HPA bottle so that it would shoot just about the same in the winter as it does on CO2 in the summer.

[Geoff]

thank you for the numbers.  I would be happy with 610-650 fps range.

I will have to think about a poly tube for the TP.  I do have a boss valve around here somewhere that I could try as well.