Well first of all yes, the cylinder displacement to barrel length ratio does effect your velocity. If you have a standard V2 AEG cylinder with say a 650mm barrel, there will be something called "barrel suck" where you will actually lose velocity.
As for spring rifles specifically, you shouldn't have to worry about barrel suck because in a spring bolt action gun the cylinder is rather large to begin with and it'd take a HUGE barrel to produce barrel suck. As far as I'm aware of, you can't buy a 'larger' cylinder for any bolt action currently on the market. A link to what you're talking about on UNcompany would be nice.
In conclusion, if you're worried about this problem and you have a spring bolt action rifle.. don't. You'll be okay because of your large bolt action cylinder. That's actually why we can reach such high velocities with our guns, we have a lot more air to push the bb with(also thanks to our strong springs).
The basic equation is that if your barrel's displacement is larger than your cylinder's displacement then you'll have a problem.
As for spring rifles specifically, you shouldn't have to worry about barrel suck because in a spring bolt action gun the cylinder is rather large to begin with and it'd take a HUGE barrel to produce barrel suck. As far as I'm aware of, you can't buy a 'larger' cylinder for any bolt action currently on the market. A link to what you're talking about on UNcompany would be nice.
In conclusion, if you're worried about this problem and you have a spring bolt action rifle.. don't. You'll be okay because of your large bolt action cylinder. That's actually why we can reach such high velocities with our guns, we have a lot more air to push the bb with(also thanks to our strong springs).
The basic equation is that if your barrel's displacement is larger than your cylinder's displacement then you'll have a problem.
