Originally Posted by Mr Idiot Box
On that Phantom Try a new silver spring. I can run mine on HPA or 12g with very little adjustment. Are you running aftermarket internals?
I'm running Silver spring with stock mirror polished internals getting 45+/- Shots @280 FPS with Lelands on a VSC setup as long as it's 70* or hotter.
I shoot around 260 with the TPC all the way out around 70*. Hence my concern about 12ies getting too warm. I get 35 useful shots starting at 280, plus or minus, on Crosman 12ies, VSC.
I'm running a silver spring and stock internals...I think. I bought most of the marker used, so I'm not 100% sure. It all looks stock to me...no fluted hammer or ported TPC. It does have an ASP Roundhead body and an undercocking kit...not sure if that would be relevant to velocity. Sounds like you're getting great results from your setup.