Like most, been intrigued based off what I'm hearing and seeing....never cared too much about FOC (or speed for that matter). I shoot heavy arrows and eventually bought a test kit a month ago. However, I ordered their lightest setup of 160, 180, and 200gr practice tips.....which compared to my normal 560gr FMJs.....the weight was negligible and the FOC gained was mediocre at best...somewhere around 4-6% gained.
However, I also keep hearing until you get north of 20% FOC, you wont necessarily notice the difference? Could be a matter of opinion, not sure.
Here's what sold me:
I shot the TAC in San Antonio in early May and The 2 guys working the booth every day were great, very helpful. It was awesome getting to handle the different BHs and field points and they were eager to let us try any and all spine/BH weight combos. I cant tell you how nice it is to try something this expensive and subjective out b4 I bought any.
Sure enough, after a dozen trials of 3arrow groups....the 250spine with 250gr up front, putting my total weight at 568gr.....flew deathly quiet and being able to literally, grab an arrow pre-cut for my length, putting a certain grain practice tip on AT the booth, nocking it, and choosing a target off the TAC practice range....best case scenario for free testing.
Smart move on their part. When everyone would go pull arrows from the 20+ practice targets, it was crrrrrazy to see my 500gr 300spine fmjs getting solid penetration of 3-4inches into a brand new target...but then to pull the Valkyrie arrows I grouped with on the same target...sticking out the back. Again, new 3D targets and it happened on every arrow with the heavy FOC up front. We then got similar results with my wife, who's new to archery and shooting 45lbs, she too was having great arrow flight and group with almost complete target penetration.
Long story short, I've committed to try them out. Will report back with more testing feedback once I get them built.
75lb Vertix
27.5 draw
250gr valkyrie BH
250spine reigns (might go with BE impacts, slightly lighter)
FOC 21.8%
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