The 1st shot/Cold bore shot?

[bustachip]

The Hornet seal iirc is a cupped seal similar to the Vortek seal. The Hornet seal requires sizing in order to make proper power. I've used all the JM Weihrauch piston seals at one time or another but I may have the name of the styles incorrect. IMO the Vortek seals under most conditions are the best replacement seal for Weihrauchs. They size themselves with some use and typically make more power than parachute styles. It's a good combination of ease of installation, durability and output. Obviously not perfect but that falls more on Weihrauchs full span piston seal concept than anything else.

IIRC the hornet seal was pretty hard. At the time I didn't have a lathe, so I sized it best I could with some sandpaper...lol, needless to say It wasn't a good fit. But I used it for awhile and did ok.

 

[Patrick1]

I have noticed that my pcp fires the first shot slightly faster, 10-15 fps. What would cause this

 

[nervoustrig]

I have noticed that my pcp fires the first shot slightly faster, 10-15 fps. What would cause this

Most likely the hammer spring tension is adjusted heavy (operating on the velocity plateau or close to it).