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Question: Determining the curvature of the bore.

@Curious and @Alex Wheeler,

Respectfully guys, I'm not an idiot. I don't treat you that way, please try not to treat me that way.

@Curious, if my restatement does not match what you said it only shows that I did not understand what you said or you don't understand my restatement. Nothing more. I think it matches and matches @Alex Wheeler 's lower diagram. As for: I think "concerned" is too strong a word. I only asked how it was determined. You asked why, then seem to take that as "concerned". I was looking for a learning opportunity. You say it doesn't matter with "quality barrels". Alex says it doesn't matter with "quality barrels". Butch says it doesn't matter with "quality barrels". Perhaps it doesn't matter with "quality barrels".

However

The DTA SRS is a switch barrel rifle. Physics is physics, barrels have a curve as in the breach and muzzle are not exactly coaxial.

I asked how to determine the deviation for a valid reason. When switching barrels on any switch barrel rifle, having this deviation in the same plane for every barrel minimizes scope adjustment required between barrels. Very simple, valid reasoning. If this deviation is all in the vertical plane then only elevation changes need to be made. A simple chart or label for each barrel, done. If you have to make changes in multiple planes because the barrels are not all indexed in one plane, adjustment is more complicated. In real life will it work perfectly, of course not. Like reloading for accuracy, it's about reducing compounded deviation.

If I were asking for a conventionally built rifle, as in threaded barrel tenon torqued into an action, I agree, it is a non issue, though as @Will Henry points out, it is worth checking just in case. @Stan Taylor takes it very seriously as a mater of pride in the product of his company and his own work. Super great. Makes me want to try a barrel from them. For a switch barrel, it is perhaps a minor issue but of course, any issue to add to the list of things to check at a competition adds to the list of possible failure points. Mantra: reduce cumulative deviation in every aspect, ammunition, rifle and scope.

What prompted the question of the original post was explained in reply #28 that @Curious asked for http://forum.accurateshooter.com/th...ture-of-the-bore.3936477/page-2#post-37083885 I was reviewing buying DTA SRS prefit barrels vs. fitting them myself and came across that comment.

@Will Henry and @Stan Taylor did a great job of explaining why I should at least check if I am going to fit a DTA SRS barrel myself. @Alex Wheeler s lower diagram was great in demonstrating exactly what I was referring to. @Curious s hit the nail on the head for @Alex Wheeler s upper diagram. Which is how I've done it in the past. @Alex Wheeles s reply # 25 http://forum.accurateshooter.com/th...ture-of-the-bore.3936477/page-2#post-37083735 demonstrates again his lower diagram.

My question was answered long ago in this thread. It is part of the reason I purchased a long probe indicator.

Too many replies after the question was answered contained "should" and "shouldn't" either explicitly or implied. IMO a very aggressive communications form.

Good shootin' to y'all.

If I have offended you then Im sorry, that was certainly not my intention.
 

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