I use Nikon optics on both my POF P415 and P308. I use the Monarch 2.5X10X50 on both rifles. The P415 has a PEPR mount and the P308 has a AD Recon mount. I don't worry about the weight, as you can see from the pic, with the bipod and suppressor the P415 weighs close to 12lbs. I have previously used the M223 and the 2.5x10x40 and really love the current 50mm model (great in low light conditions). Where I currently hunt, about 600-700 yrds would be the max shot taken or I might consider a higher power. Nikon's Spot On website is fantasic for use with the BDC.