Home Forums Hunting & Shooting Hunting Optics Scope failure

To add to the story a bit more, at least for me, what is the .290 that's subtracted and what are the numbers in the line below your cartridge and powder? Thank you.

'Morning.

The cartridge is the 30BR. The .290 is the size that a single bullet makes in the target paper. That measurement, rather than the diameter of the bullet (.308), is what's used to subtract when correctly measuring group size.

The size of the hole in the paper will vary with the type of paper, the backer material and how tight the paper is to the backer. Most bullet holes will run about 5% smaller than the actual bullet diameter.

I make my own .30 cal. bullets using J4 jackets. Core material will have varying amounts of antimony depending on what I'm trying with core seating pressure. The .3084 is the diameter of the bullet shank, .3086 is the diameter across the pressure ring, .375 is the base to ogive length (of that particular lot) and the 1% is amount of antimony in the core material I used for that lot of bullets.

Good shootin' -Al

I didn't realize that Al. Thanks for the knowledge

I measure the two furthest holes on the same side of the hole. That is the Northeast corner on both or the south most on each hole and so forth. So, I think that means the hole size wouldn't matter.

Bugger

That would be a bit tough to do in Al's case.

In fairness,I've never seen more than (3) NIB Reupold's puke on their Maiden Voyage,all on the same day. (2) 3.5-10x 1" and a 6x42. Hint.



A GOOD Rifle,will resolve much. Hint.

Fhuqking LAUGHING!.............

I’ll never buy another Leupold

You gals are fhuqking HILARIOUS! Hint.

https://youtu.be/4disIUzq8lM




Fhuqking LAUGHING!.................

As an update.....the March proved killer good for tracking, holding POI, returning to zero and optical quality.

Good shootin' - Al