svd draganov

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My m8 has pruchased a Cyma SVD Draganov and wants to upgrade it.
So far he has added a tightbore and a better hop rubber,currently it is firing at 410 fps on .25's.
There doesn't seem to be a lot of info on upgrading these,(450 on .25's is his target)ideally he'd like to swap the sping but he doesn't know what size to go for,etc..any help or pointers appreciated...thanks.

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Re: svd draganov

My bad...don't worry I just realised that 405 on .25's is 450(ish) on .2's...