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I have made pillars from:
3/8" brass tubing.... dissimilar metals problem for the rest of the rifle
3/8" stainless tubing,. dissimilar metals problem for the rest of the rifle
3/8" steel tubing.... my favorite
1/2" Aluminum...... dissimilar metal problem for the Aluminum
I remember 8th grade shop class: https://en.wikipedia.org/wiki/Galvanic_series

I like to glass bed pillars pre compressed. This may require making custom washers for fixturing.
I like to 1.25" diameter side cut the end of the pillar to fit round receivers. 20 years ago, Steve Acker, the gunsmith machinist used boring head to match the pillar end to the receiver radius.
I used to do this, but the end mill is faster and slightly undersized. That lets the receiver spread the pillar ear in compression for better traction for the bullet twist reaction.

I like to rough up the pillar sides so the epoxy can grab the pillar.
I run a tap through the pillar hole in the stock, so the epoxy can grab the stock.

https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/ubb/showflat/Number/14622540


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The man who makes no mistakes does not usually make anything.-- Edward John Phelps