Stupid question for the day

[deerkiller]

I found a load my RU muzzy likes, 150 gr triple 7 pellets pushing a 275 Parker BE. I don’t have a chrono and was wondering if anyone shooting the same load had a rough estimate on the muzzle velocity. I can find generic info listed on line by the manufacturers of what it roughly is with 100 gr of t7, but nothing for the 150gr.

I plan to get a chrono soon, was just curious if someone already had some rough estimates with the same set up. Thanks