Není pravda, že Walther nedoporučuje HV. Je to v pohodě.
Psal jsem výrobci/distributoru Umarex USA přes jejich oficiální helpdesk formulář:
Hi,
 I just managed to fire 150 rounds of Federal "American Eagle" from my 1911.22 "Gold Cup", only then to realize it was "High Velocity" ammo. 
 So I'm striving to know - is it okay to fire .22HV from your 1911 Gold Cup, or is it harmful to the gun? Or is it something "doable, but not recommended" - maybe something reducing the service life of the weapon?
A odpovědi:
Use High velocity ammo or Standard velocity, preferably copper coated, for best performance. We do not recommend using subsonic ammo. 
 We recommend the following ammo:
CCI - Mini Mag, Velocitor, Stingers
RWS – Target, High Velocity 
Federal - Game-Shok, Auto Match, Champion Target (Copper Plated HP)
Most Winchester – Xpert - Super X 37gr HP, Super X Power Point, Super X Lead Round Nose 40gr
Wolf
Eley 
Aguila HV
 We DO NOT recommend the following ammo:
Winchester Wild Cats – (leaves excessive lead debris behind)
Any form of Remington – (oversized and will not feed into chamber well)
   Please let me know if there is anything else I can do for you and I will be happy to assist you. Thank you for purchasing an Umarex USA product! Happy Shooting!!
Dear ******,
 You can shoot high velocity ammo from that gun. Thank you.
Ale 
prakticky vzato je to s HV citlivé na úchop - stačí malinko limp wrist a seká se. Ale jak se to člověk naučí pořádně pevně držet, dá se střílet i s HV rychle nebo velmi přesně a přitom 100% spolehlivě.