With a short inner barrel, the only way to achieve better bullet stability is to use heavier BBs such as 0.25g. At the stock power level, you should not use anything heavier than this. You will also need to use a slightly stronger spring to compensate for the drop in FPS due to the heavier BBs. A M120 spring can sustain 0.30g perfectly, while a M130 (or above) spring can drive 0.4g and produce great impact.
In terms of accuracy, a long inner barrel can always make a visible difference. In terms of range, at the stock level the difference is minimal, while at 400FPS or above you will start to see greater differences.
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