FFP Versus SFP Scopes For Hunting
BY Herschel Smith
Had this scope been a first-focal-plane (FFP) scope, it would not have mattered at what magnification the scope was set, and we likely would have had 300 pounds of meat to haul out. In a FFP optic, as the reticle is etched or marked on a forward lens in the scope, the holdover hash marks below the crosshair would have been the same value, placing a bullet in the same place at 4X as they would have at 12X. However, this was a second-focal-plane scope, which means the reticle was marked or etched on a lens in the rear, closer to where you look into the scope.
Being a SFP scope, the reticle on my 4X-12X Bushnell will always appear the same size as the magnification is adjusted, but changing the magnification does change the hash marks on the reticle in relation to the target. This is where some of you readers may want to start looking through your scope and twisting that magnification ring. In the story above, at 300 yards, the second hashmark represents approximately 10.5 inches (3.5 inches x 300 yards) of drop at 12X magnification. At 4X magnification, that second hashmark just turned into 31.5 inches (12X = 10.5 inches; 12X/4X = 3 times more value; 10.5 inches x 3 = 31.5 inches). This hold at 4X put the bullet 20 inches over the intended point of impact.
With a FFP scope, the reticle will grow and shrink as you adjust the power ring. This does little good on a scope with a standard duplex reticle, as your only holding mark is the crosshair itself, centered at any power. Where FFP is a help is when you have a drop reticle with hashmarks for simple holdover or when you are using a system such as MIL-DOT. If the scope on that rifle had been a FFP scope with MIL-DOT subtensions, the magnification power would not have mattered as the second hashmark would always be a 10.5-inch value at 300 yards.
That’s all well and good, but that reticle sure does appear small on any power for a FFP scope. If you plan on shooting from one ridge to another, a FFP scope is the best bet. If you plan on shooting east of the Mississippi, you’re probably better off with a SFP scope. I’ve had a FFP scope mounted and wished I had a SFP scope.
But YMMV and everyone has his preferences.