Well, not a ton of info I've found to tune one of these. Wish there were other options for the extended mag boxes. Have another one on a 375 ruger, feeds great but only way to get it to cycle right, or even at all, was to close lips enough to not allow feeding through action, the only way that one gets loaded is from hinged floorplate. Not end of the world So, got the box and flat follower for the short action 700, for the magnum. Trying to get a 7saum to feed. I installed it as recieved, does not work at all. Bullets nose forward, jamb on the mag well. So I bend lips on the mag well forward,, out,, to get shell riding parallell, back to not enough grip on shell, they simply pop out of magazine. Planning on sqeezing it back closed, again trying to keep feed lips open in front. The mag well tapers, but box is flat,,,,not sure how to get rounds riding flat? feed lips would seem like they should taper too? Then you have the flat follower, that keeps coming loose, I've crimped the two leafs, but it will work itself loose,,,,glue? spot weld? Any posts or any tips out there for these?? Need more length than the 2.84 factory box gives me. Are there other options?? My reciever is cut for the extended boxes, any other makers? Any tips are appreciated!