load testing bergers

bretterath

Well-Known Member
Joined
Mar 14, 2011
Messages
286
how do u guys go about load testing your berger? i am shooting a 7wsm 168 bergers with H1000. Do u guys do a ladder test then try at different yardages, or do u load up half grain incriments and then go out and shoot? What yardage are u load testing when starting off with your load data?
 

Maxxis31

Active Member
Joined
Jan 2, 2013
Messages
42
I recently worked up a load for 168 Bergers for both a 30-06 and a 280AI. I started both tests .010 off the lands and jump tested from there.

30-06

I started this load by testing different powder loads seating them all .020, I used IMR 4350 and went 52-53-54gr. 53gr shot the best and from there I loaded up a jump test starting at .010 off the lands all the way out to .130 off going in .030 steps. All the loads shot under 1" at 100 yards and since the 168 VLD's are kind of short in 30cal i chose to seat a little deaper so more bullet was in the case. I settled on .090 off the lands with 53gr of 4350 and the rifle is shooting right at 1/2" consistently. This is a spare rifle now so 1/2" at 100 yards is good enough for me.

Load

Berger VLD Hunter 168gr
43gr IMR 4350
CCI Large Rifle Primers
Lapua Brass
3.408 COAL (.090 off lands)

280AI

I started this load in a similar fashon but started with seating depth first. I started .005 off the lands and jumped by .020 out to .080 off. After .030 my groups opened up. I then reloaded and jumped by .005 from .005 out to .020. The best groups were just under 1/2" at 100. From here I tested different powder charges and am shooting 62.5gr - 64gr of Retumbo. (63gr is recommended max). I started with the 62.5 gr checking for excessive pressure as i went. The 64gr loads were still good but I could make out ejector marks on the brass. Primers looked good and bolt opened easy. However 63gr worked the best and printed 1/4 or less at 100 yards. I am still working on this load but am now going to move out to 500-600 yards and tinker from there. I don't think i will learn much more at 100. I am shooting off of bags so 1/2" or less at 100 yards is pretty good for my ability.

The 280AI will be similar to the 7mm WSM for powder / ballistics. The Retumbo even at 63 gr is a compressed load and I don't believe It is possible to get enough powder in the 280AI case to make it dangerously over pressured.

Load

Berger VLD Hunter 168gr
63gr of Retumbo
CCI BR2 Primers
Norma 280 rem Brass (fire formed to 280AI)
COAL 3.414 (.010 off lands),


The way I measured the lands is by taking a fired brass and rolling the end on a hard surface so that the bullet has a little resistance when inserted. I then carefully chamber the brass with the bullet just barley inserted and close the bolt. When removing the bullet I make sure to use my hand to keep the bullet from being shoved against the side of the action on the way out. I then carefully take the case and measure overall length. I do this several times and average the length, I subtract .010 and load up my first set of loads to this length. Make sure to measure to the ogive.

Hope this helps!! Berger has a good article on dialing in the VLD on their website.
 

Firearrow

Well-Known Member
Joined
Jul 7, 2009
Messages
366
Location
Sacramento, CA
This might go against what some might do, but it works for me. I start of at .01 off the lands and do a standard .5 gr increase until it find the best group with the best ES. Normally I hope this is about 1.0 to 1.5 less than my rifles Max load to keep things safe in the summer time.

Then with this "best load" I will make two batches for test loads with different COAL's.
3 at .01
3 at .05
3 at .08
3 at .13

The two batches are to validate my results. Once again looking for the best group with the lowest ES. This is basically what is in the Sticky for "how to get the best results from your Berger's".
 

Recent Posts

Top