Thread: Bore Sighters - any good?

I got a bore sighter awhile back, thought it would be good to be able to get scope roughly sighted before making fine adjustments.

Unfortunately the one I got (pokes down end of barrel and fits .177-.5) was useless as laser could barely be seen at 5 metres (at night), so I never got a chance to test it.

Before I buy another one, I thought I'd ask;
Are they worthwhile?
Should I get a multiple-fit one, or get the cartridge style ones specific to my rifles?

Thanks!

(If anyone wants my crap multiple-fit one to try and fix just let me know).