Been trying fullbore shooting with an Omark this year, and really enjoying it. But, I'm left handed and getting tired of 'swimming' my arms after every shot to reload. I want to build a fullbore rifle out of a lefty Remington SPS I have lying around, but I'm hung up on a stock. I haven't done enough to be convinced of the dimensions I want so a full custom isn't in the cards. Boyds' doesn't offer the Pro Varmint in lefty SPS (and yes, I called, asked, filled out the form). What's a good beginner stock I can mess with until I find my formula for LOP rise?