been hardcore with stick bows for 30+ yrs. i have absolutely no first hand experience with ILF rigs other than online research and ytube videos. specifically, im looking at lancasters site at the SF plus axiom recurve limbs. it seems that limbs are offered in long, medium and shorts. is it industry standard to rate the draw weight with a 25" riser?? im looking at a 17" riser. the SF limbs on a 25" riser are rated 40#, how would i know what draw they'd be on a 17" riser?? basic questions so bear with me...again, no first hand experience in this area of archery, thanks