Hi, I hope someone can help with this query.
I have a Walther LGU in .22 calibre. This is a UK legal gun which I confirmed with Walther in Germany.
However, when I chronograph it, with various weight pellets I get a wide variation of readings some of which take me into FAC territory.
I have an FAC so this is not an issue but why am I getting such a variation in readings?
I understand that a heavier pellet would normally produce a higher ft/lb, but some of the legal sub 12 ft/lb readings register with the heavier pellets and the over 12 ft/lb reading come with lighter weight pellets.
RWS Superpoint 14.5 = over
H&N Sniper light 14.04 gr = bang on 12 ft/lb
Rangemaster Sovereign 15.89 gr = over
Gamo PCP Special 18.21 gr = legal
RWS Power Bolt 24.7 gr = legal
JSB Jumbo Express 14.35 gr = over
The variation is from 11.04 ft/lb - 13.2 ft/lb The chronograph is the Combro cb-625 with a new battery fitted.
Thanks
John
I have a Walther LGU in .22 calibre. This is a UK legal gun which I confirmed with Walther in Germany.
However, when I chronograph it, with various weight pellets I get a wide variation of readings some of which take me into FAC territory.
I have an FAC so this is not an issue but why am I getting such a variation in readings?
I understand that a heavier pellet would normally produce a higher ft/lb, but some of the legal sub 12 ft/lb readings register with the heavier pellets and the over 12 ft/lb reading come with lighter weight pellets.
RWS Superpoint 14.5 = over
H&N Sniper light 14.04 gr = bang on 12 ft/lb
Rangemaster Sovereign 15.89 gr = over
Gamo PCP Special 18.21 gr = legal
RWS Power Bolt 24.7 gr = legal
JSB Jumbo Express 14.35 gr = over
The variation is from 11.04 ft/lb - 13.2 ft/lb The chronograph is the Combro cb-625 with a new battery fitted.
Thanks
John
Many thanks. I need to put more pellets through both guns it seems. Happy to do that. Thanks for the information. 
It's been my experience that as a barrel breaks in the speeds will normalize. In other words, your ES and SD numbers will get smaller. That said, power, as you know, is dependent upon mass and velocity and has little to do with power source. An 18 grain pellet moving at 671 fps will always carry 18 ft-lbs, regardless of whether it's fired from a springer, PCP, or CO2 gun.
On a general rule:
CO2 or PCP = higher power with heavier pellets
Springers = Higher power with lighter pellets
Of course this is within reason. A vfg cleaning pad on a springer will not give you higher power than lead pellet.
CO2 or PCP = higher power with heavier pellets
Springers = Higher power with lighter pellets
Of course this is within reason. A vfg cleaning pad on a springer will not give you higher power than lead pellet.
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