Quote Originally Posted by TCooper View Post
Hi webranger,

Here are a few possible problems to check for when velocity drops in the HW45.

1 - Breech seal. Nicks or missing chunks will effect velocity. Sometimes a thin shim under the seal will help a sloppy or worn example.

2 - Broken mainspring. The HW45 often sees close to 10,000 shots before the spring is broken. I'm not sure if you shot this much in 2 years. Velocity will sometimes drop a bit when you pass the halfway mark but you had a large drop. Possibly the spring was not a good example.

3 - Dry pistol. I find I get best velocity when there is a very slight dieseling. After the shot I can see a very faint, palm sized, whitish cloud at the muzzle. There is no loud bang from the fuel burn and velocity is consistent.

Cheers,
Todd
It has seen much use, it is quite dry the seal seems Ok not checked the mainspring. I think it would definately benefit from a good tune.
John