Thanks! I appreciate everyone who is sharing their information.
Mr. TommyD: i keep looking at the TSX's, and as i said before, I want the TSX to work really bad. They just work so well on game! I love them! But so far they have not fired accurately in my rifle(*). Even the boattailed ones are only 'slightly' so, and have a nice long bearing surface so that the projectile will still be held square to the bore when the projectile engages the rifling as my rifling begins 0.17" from the case mouth- most any bullet has a >0.17" bearing surface: thus meeting Mr. Smith's advice for helping accuracy with an oversized chamber throat. (**) So I am not sure if his flat base recommendation has to do with an even pushing surface for the expanding gas, or obturation of the bullet base, or something else.
Mr. RaySendero, I have also looked at the Swift A-frames. I know they are similar in construction to the Nosler partitions. DO the "A's" have an open base? how do they perform on game animals?
So my issues are that I have 2-3 variables going on at once (***), and am taking the advice of Mr. Veral Smith, as written in the linked threeads; someone whose vast knowledge and experience with this matter soundly dwarfs my own.
Mr. Scatterbrain, have you loaded and fired the 200gr in a Saiga 308? or any semi-auto 308 even? I'd love to hear how they performed. Also, your experience perceived recoil and wear-and-tear on the rifle itself would interest me, esp. because the 200gr TSX's are also flat based! I always thought them too heavy for the rifle, but if they work; well, i am good with that.
Many thanks again to all who have shared advice and experience!
Have a blessed and peaceful Sunday!
C-
(*): if after lapping the TSX shoots well, then I am done; problem solved.
(**): that is, that the rifling will be engaged by the bullet squarely before the casemouth 'lets go' of the bullet. the casemouth acting as a support for the bullet. Normally then chamber would do this, but mine is oversized.
(***): variables to my ultimate accurate hunting load are; 1. oversize chamber throat (.345-.346) 2. bore constriction of .001 at the muzzle end of my barrel (from land/groove of .302/3095 until the last inch or so then tightens to .302/3085), and 3. possible inherent slop in my rifle (which i have not yet addressed, but the sad possibility has occurred to me)