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nope... length is not necessarily a sign of strength.
Without a spring test rig you will just have to throw it into a gun and see. Barrel volume and cylinder volume also help determine final fps. There's other factors too like how quickly the air is delivered and air seal etc...
spring factors that also vary including length are irregular pitch or progressive springs that are easier to compress at one or both ends to start compression and then they progressively get stiffer towards the middle or other end of the spring. So just squeezing a spring may not give you a good answer.
Install one... pull it out.. label it. repeat
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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