Range Report Zero shift data - Lot to Lot variations

[Shawd43]

Interested to see if anyone has some hard data on zero shifts due to lot to lot variations. I’m trying to confirm or deny wether or not there is a shift at 100 yards due to lot to lot deviations, for example; lot A measures .628 base to ogive.. lot B measures .618.. lot C .638 etc. This may be insignificant shifts that are still within the MOA of the rifle and wont make much difference under 1k yards. Just want to see if anyone has some input or hard numbers to share, thanks guys.

 

[Dthomas3523]

You’ll see POI changes at times due to powder or seating depth variations.

You’ll see data changes at distance due to MV and BC changes.

Sometimes you see none of the above, all of the above, or a combination.

 

[Shawd43]

Yah I haven’t noticed a shift due to projectile variations yet, just curious because I check zero so often and always have the ability to tweak it. However this recent lot of Berger 140 Hybrids was over .010 difference on average when compared to the past 2k I’ve ran through this barrel. I mean I haven’t changed my zero more than a tenth since my last barrel. I have always just focused a lot on neck tension and consistent jump (along with much more of obviously) but I would imagine that as I’m chasing my throat erosion having a bullet that’s over .010 shorter on average I’d see some actual changes, due to pressure or whatever. I wish I had the time and resources to just burn up barrels gathering data. Haha that’s never going to happen though.

 

[Dthomas3523]

Ah, thought you were asking about factory ammo.

With Berger bullets, you won’t see much difference lot to lot. Unless you’re shooting very small targets.

 

[Shawd43]

Sorry if I was misleading, yah I’ve never seen much lot to lot at all. Of course they are super jump insensitive. It made me curious when I saw that kind of avg. variation. Thanks for the feedback.