Re: best beginning LR pistol caliber?
A number of options.
Depends on how far you want to practice at:
6BR, 6 Dasher, 6mm-6.5x47 Lapua, 243 Win, 6-284 ( I have all but the BR and Dasher).
6.5x47 Lapua, 260 Rem, 6.5-284
I would use a 1-8 twist for all of these.
In 6mm I would use from the 95 grain VLD's to the 105/107 class VLD's
in 6.5 I would use the 123 to 140 grain bullets
Any of these cartridges will work fine for varmints, deer and LR practice.
Have you read my article on using high magnification rifle scopes on specialty pistols?