Questions about new (to me) Brocock Sniper HR

I just got bought a used Sniper HR .22 and have a question. It's been so cold here, that I just couldn't stand to set up my chrony and check things out, but I have a question about shot count. Reg pressure is ~145, and hammer spring is .075" from flush, transfer port on #6 (wide open). This is a .22 with a 480cc carbon fiber bottle. I'm only getting about ~40-50 shots on a 240BAR fill. Is this normal? I thought I saw a review that said something like 80-100 shots. I know this is nearly max power on this rifle, or at least it looks pretty close. I don't really care about the shot count, but I was wondering if this is normal
 
I just got bought a used Sniper HR .22 and have a question. It's been so cold here, that I just couldn't stand to set up my chrony and check things out, but I have a question about shot count. Reg pressure is ~145, and hammer spring is .075" from flush, transfer port on #6 (wide open). This is a .22 with a 480cc carbon fiber bottle. I'm only getting about ~40-50 shots on a 240BAR fill. Is this normal? I thought I saw a review that said something like 80-100 shots. I know this is nearly max power on this rifle, or at least it looks pretty close. I don't really care about the shot count, but I was wondering if this is normal
you really need a chronograph ! most of us have a fx pocket chronograph because you dont have to set up anything , my gun get somewhere around 100 shots , shooting a 16 gr. around 900 if i rember right , but if you have a fx pocket crono you can get a answer quick and easy
 
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