Target rifle foresights , newbie question.

[jimjams]

Why do target rifles have 'ladder adjustable height tunnel foresights' and why are they fixed by an assembly and not just anchoreed on to th etop of the barrel?.

The foresight assembly appears similar to my ANSCHUTZ .22 target rifle so what's the difference apart from calibre and range.

Regards JJ

[IainWR]

The elevation setting on a TR varies far more than on a .22". An adjustable foresight allows the rearsight to stay in the same place (more or less) so your head position doesn't change as you go through the distances.

[Watcher]

My understanding is that the ladder adjusts in increments of five minutes of elevation. Can't afford one at the moment but one day maybe

[rox]

Why do target rifles have 'ladder adjustable height tunnel foresights'

The reasoning for height-adjustable foresights has been covered, but note that the 'ladder' is just one style of height-adjustable foresight, and a slightly outdated one by current standards. The drawback of the ladder is that it usually remains fixed to the barrel in transit, and it's a vulnerable protrusion that is easily damaged (you *can* remove the ladder, but as-manufactured they do not locate sufficiently accurately to routinely remove for transit). It also sits in the sight-line of a scope, should you choose to attach one for ammo testing etc (although not in the focal plane, so it's not impossible to work around this).

why are they fixed by an assembly and not just anchoreed on to th etop of the barrel?

Barrel changes for TR rifles are much more routine than for .22's, so the mounting needs to be easy to machine, easy to eliminate cant in the sight system, and more rugged.

My understanding is that the ladder adjusts in increments of five minutes of elevation

Some are nominally 5 minutes, and some 6 (even with the same pitch). The important thing is not to mix (or add) front and rear elevations, e.g. don't expect that 30' on the front and 10' on the back is necessarily identical to 10' on the front and 30' on the back. Record them separately. Once you have established the setting required on the front for each distance your rear elevations should all be within a few minutes of each other, and therefore head position and cheek pressure more consistent across distances.

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[jimjams]

Thank you. jj