Anybody got any thoughts on which rifle I should go with? I'm am going Stainless synthetic most likely 300 RUM. I have had to return 2 Sako TRG-S rifles in a row because the groups started to open up after only about 200 shots. The Sako cold hammered barrel rifling just does not look like it is cut deep enough or is well defined to me. I don't suppose I can use my sako scope rings on the sendero, what rings would you recomend? Thanks for any thoughts!