New lot of Berger Juggernaut difference in OAL

[Tony1320]

I just opened a new lot of Berger Juggernauts and they are different BTO than my old lot how should I proceed.

My old lot using a Sinclair OAL guage I got a reading of 1.665 + .603 (Juggernaut) = 2.268 BTO and I was loading to 2.258 for a jump of .010

My new lot with the same Sinclair OAL guage I get a reading of 1.679 + .595 (Juggernaut) = 2.274

So should I continue to load to 2.258 or go off my new reading and load 2.264 for a .010 jump

Using Lapua standard brass

 

[XTR]

I've seen .030 variation in Juggs BTO, but never had to change my seating depth setting on the die.

Seat one with what ever seating method you use. Measure BTO on the loaded case (don't worry about what the bullet measures base to ogive) Don't worry about any + or - figures, just measure BTO. (assuming you have some kind of tool to measure to the ogive with your calipers)

If the new bullets seat with a longer or shorter BTO measurement adjust your die to duplicate what you had with your tools. It should shoot there.

You may want to go back and verify your load with some test groups, but when I shot the Juggs in F-TR a few yrs ago I once tested them for jump. From an F-TR rifle off of a bipod at 300 yards I couldn't see a measurable difference in group size from the -.015 I jumped them in my loads out to about -0.60. So in the end it probably wont matter one way or the other with this bullet.

 

[memilanuk]

What is the 1.665 and 1.679 coming from?

When you load the new bullet in the case, is your loaded round base to ogive (base of case to ogive of bullet) any different than before? If not, leave it along and go shoot some test groups. If it doesn't shoot or behave any different, file it under 'interesting/good-to-know' and move on.

 

[Tony1320]

What is the 1.665 and 1.679 coming from?

When you load the new bullet in the case, is your loaded round base to ogive (base of case to ogive of bullet) any different than before? If not, leave it along and go shoot some test groups. If it doesn't shoot or behave any different, file it under 'interesting/good-to-know' and move on.

Those numbers are the measurement from the Sinclair oal guage

I havent loaded a round yet so i dont know

 

[Tony1320]

I've seen .030 variation in Juggs BTO, but never had to change my seating depth setting on the die.

Seat one with what ever seating method you use. Measure BTO on the loaded case (don't worry about what the bullet measures base to ogive) Don't worry about any + or - figures, just measure BTO. (assuming you have some kind of tool to measure to the ogive with your calipers)

If the new bullets seat with a longer or shorter BTO measurement adjust your die to duplicate what you had with your tools. It should shoot there.

You may want to go back and verify your load with some test groups, but when I shot the Juggs in F-TR a few yrs ago I once tested them for jump. From an F-TR rifle off of a bipod at 300 yards I couldn't see a measurable difference in group size from the -.015 I jumped them in my loads out to about -0.60. So in the end it probably wont matter one way or the other with this bullet.

This is the info im looking for

I use a Sinclair bullet comparator

I will load a test round and adjust from there if necessary thanks

 

[barefooter56]

This is the info im looking for

I use a Sinclair bullet comparator

I will load a test round and adjust from there if necessary thanks

XTR and Milanuk have given you the correct answer Tony. You MAY have to adjust the powder charge up or down a very little bit ( tenth grain moves suggested) if you fall off your velocity accuracy node. If you have any questions please contact us here or at techsupport@bergerbullets.com

 

[T-shooter]

Probably the most important measurement is from the base to ogive to have consistent jump distances. Another thing that may also have an effect is the case capacity if the bullet doesn't seat as deeply.

I was testing with .223's and CFE223 powder. By setting the bullet out from 2.260" to 2.300", the velocity fell off by an average of 30 fps and it took 4/10 grain more powder to bring the velocity back up.

 

[Tony1320]

XTR and Milanuk have given you the correct answer Tony. You MAY have to adjust the powder charge up or down a very little bit ( tenth grain moves suggested) if you fall off your velocity accuracy node. If you have any questions please contact us here or at techsupport@bergerbullets.com

I just got back from the range I loaded some test rounds same charge weight and same previous base to ogive and results were excellent.

Thanks for chiming in