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Doug White

wrote in news:6c323785-aac6-457c-bbd7-
:

snip

It's not the bit, you'll get build up on just about anything when
drilling that stuff dry. Lots of stuff will work to keep the chips
from welding, some healthier than others to use. Tap lube made for
aluminum comes up top, runs through various oils, even milk!. Tap wax
will work, you can just jab the drill into an end as needed.

Best design for a publically-used target holder I've seen used pipes
stuck in the berm horizontally, end on to the shooters, each pair
spaced 2' or so and had Vs cut in facing sides to hold the cardboard
backers. They didn't get shot up, no richocet problem, you just had
to have cardboard cut to the right size. Used about 1 1/2" pipe.

Our range has 25 yard targets in front of 50 yard targets, and the 25
yard targets are on a turning system for matches. It's all a bit
complicated, but it's been working well for the 35 years I've shot there.

Doug White