It's a procomp arrow, not fmj. Similar in construction, supposedly designed for hunting. Supposed to be lightweight, that will make it better for those who want more foc.
They are 4mm. Are .166 inside diameter. The 250 has an od of .245. Use half-outs or deep six components. Seems they are pushing the half-outs with them.
$265 a dozen.
Spines of 250, 300, 340, and 380. A good bit lighter than the fmj's. More like the acc super light. The aluminum is on the inside instead of the outside. So kinda the opposite of an fmj.
On Eastons website it has them listed with an od of .290, and a gpi of 11.5, lighter than the 300s, but still on the same webpage as the other FMJs. On blackovis.com it looks like I can order the 250 spine FMJ for the same price as the rest of them, 147.99 a doz.
I was going off of the Lancaster catalog. I actually completely missed that they are listed under the fmj's as well. Easton didn't have them that I saw on the website. Looks like they are listing a 5mm fmj with a 250 spine @ 11.5 gpi while the 300's are 12 gpi. Something doesn't make sense.
I was suffering from the heat earlier while responding while I came in for lunch. Guess I lead you in the wrong direction. Can't help much on the fmj's other than I suspect a misprint on info that Easton sent to vendors.
Was at the shop the other day and was discussing this with the tech since when I asked about the 250 spine shafts being lighter he was thrown off.
I ended up buying three 250 spine shafts to play with and so far have had great results. I was previously shooting 300 spine FMJs, but am looking to pick up FOC. I was able to go from the standard HIT insert to the 50 grain brass insert, which combined with the lower gpi led to a net gain of just 19 grains, but resulted in FOC increasing 3%.
Minimal trajectory difference out to 40 yards, haven't shot further yet. Will probably increase my draw weight a few pounds and to gain that speed back.