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The term "tightbore" doesn't necessarily MEAN tightbore anymore. We just use it to describe an upgraded barrel.
Stock barrels are typically 6.08
"tightbores" are 6.01 to 6.05
"widebores" 6.08 to 6.23
The trick is the balance. A 6.01 and 6.08 barrel have the same potential for accuracy.
It happens that the 6.01 is more often manufactured to way better standards than a 6.08.
Problem is the 6.01 is going to foul very quickly and affect your accuracy after just one mag.
But a wider bore needs a stronger spring due to the air loss around the BB. Going from a 6.04 to a 6.10 I lost about 30fps on the PTW.
The BB doesn't actually ride the barrel like a bullet in a rifle barrel. It rides a cushion of air centering it down the barrel. So the actual diameter of the barrel is not critical, within reason, what matters is the quality, consistency, and concentricity of the barrel.
Orga makes a 6.10mm barrel for PTWs, and they come damn close to being on par with the new evo 6.04 barrels, and the 6.10 outperforms some other 6.03 and 6.05 barrels.
Barrel quality is more important than barrel diameter
And the tighter the barrel, the faster your accuracy will drop off.
With a 6.03 in my bolt action rifle, I noticed accuracy loss after just 130 rounds, it's not significant loss, but it's enough to be a huge pain as a marksman.
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