Bullet lot and tuning question

[Raydee]

I have been having good luck with my 6BR setup, everything has been shooting real well until just recently. I thought it may have just been the weather but today I think I found the culprit, it looks like when I opened a new box of Bergers they are a different lot number than the ones I have been using all season.

Now the question is do I go back and do a full new work up, powder, seating and tuner or should I skip the powder and just do a seating and tuner test to see if i can get it back on track?

 

[Bill Norris]

I have been having good luck with my 6BR setup, everything has been shooting real well until just recently. I thought it may have just been the weather but today I think I found the culprit, it looks like when I opened a new box of Bergers they are a different lot number than the ones I have been using all season.

Now the question is do I go back and do a full new work up, powder, seating and tuner or should I skip the powder and just do a seating and tuner test to see if i can get it back on track?

I would try seat depth & tuner first. I have learned from experience to check a new box of bullets before starting to load from it. Ogive sometimes is in a different place and often in different places from bullet to bullet. Just sent app. 1500 back to Sierra due to this.

 

[jackieschmidt]

That is one of the things that separates a full custom bullet from a semi custom bullet.
There is no guarantee that the different lot even came out of the same die.

I guess you have to do what ever it takes to return the rifle to its optimum tune.

 

[64Rambler]

Yep, I got burned with a new lot of bullets I didn't fully check out. Weight, OAL and BTO were a match to a previous lot that was giving me 1/2" groups at 200. The new lot gave me 3" groups, found the day of competition and which really didn't translate to 600 yds very well at all. A quick seating depth test gave me a new CBTO number and back to better groups, but not until after a disastrous 3 x 600 score. Lesson learned.

 

[Clancy]

When I switch lots, it’s only by necessity.

I will redo the seating depth test. I haven’t found the need to do anything else.