Old Diana 50 underlever info

[Tucobenedicto]

Hi guys, i am working to a restore of an old diana model 50 underlever in .22, i cant find wich level of energy this piece of history is capable of.
Anyone can help me?

[Toxylon]

It depends somewhat on the age of the gun. The early D50's, from the 1950' to 1960's, were lower in power than the later, 70's to 80's variant, which would shoot around 245 m/s  / 800 fps / 15 Joules  / 11 fpe in .177 cal.

I haven't seen stats for the .22 cal, but the .177 cal numbers give a solid starting point for estimation, especially for the muzzle energy.

[Tucobenedicto]

Thanks Duke, it seems is an early model, very rare in .22

[Toxylon]

OK. I'd reckon it would reach around 12 or 13 joules at the muzzle. But you are entering the twilight zone with such a rare caliber / gun combo!

[MDriskill]

The model 50 is not a high-power rifle. It has the same powerplant as the model 35 barrel-cocker, but is less powerful due to the "lost volume" of the transfer port and loading tap. Old guns I have chronographed (NOTE, these are all OLD, and NONE have been tuned!):

+ .22 cal 1950's model 35, 8 FPE
+ .177 cal 1980's model 35, 9 FPE
+ .177 cal 1950's model 50 no. 1, 5.5 FPE
+ .177 cal 1950's model 50 no. 2, 5.6 FPE
+ .22 cal 1960's model 50, 5 FPE

I would guess 8 or 9 foot-pounds (10 to 12 joule) at most for a well-tuned the model 50 - but don't be disappointed if it's a bit less.

[Tucobenedicto]

It seems a very old model, the exploded view i found shows a lever safety and two o-rings on the loading tap, the one i have has no safety and no o-rings.
Not an hunting rifle for sure.
Thanks to all.