Berger 109 hybrids in 6BR
- Thread starter Jarrodb1975
- Start date
I run them in dasher at 6br speeds.
Same results I’ve had with 6x47 and 6gt. Most consistent bullet I’ve run in a 6mm.
Same results I’ve had with 6x47 and 6gt. Most consistent bullet I’ve run in a 6mm.
@Dthomas3523 im about to have a dasher barrel spun up for my AI. I’d imagine you’re getting just about zero recoil with this load?
I run everything under 2950 in all my rifles. So I’m probably not the best to compare recoil.
I will say, BR cases have a “snap” recoil and 6cm and 6x47 have a “push” recoil.
Running 109’s in a dasher. They are fantastic bullets. Running them with 32 plus grains of Varget and trying 4166 as a replacement. So far everything is working out.
That is exactly what I hope for too. My 6 creedmoor was fine out far but when u shooting unstable at close range it’s hard to catch your impact sometimes.
I'm shooting them in a 6br at 2825. They have been hammering. Very consistent.
I thought mine was slow, bit consistency is more important than a couple 0.1s. Several guys here running 28" XCalibers that will finish out at 2850ish.
I trued everything out to 1000 yards yesterday. Ended up at 2815fps. My magneto must be reading slow.
Did u true just velocity? It did u true the bc out to 1000 yards? If u trued bc what did u end up with? Very interested in this bullet
Magneto never aligns with my truing at distance for speed. I use the magneto to get close and true for actual speed....as TH says "believe the bullet, it doesn't lie."
Yeah. I think that’s why a lot of guys miss at longer ranges. They think what that magneto or lab radar says is the gospel.
Truing is best when you do it as close to transonic as possible is you can. Meaning, my 6BR goes transonic at about 1200 so I true at 1000 and verify all the way back to 300. Then I tune the BC.
Your BC truing is important if you plan to shoot something within the transonic range.
I tried the 109s in my 6BR and could not get it to shoot at all, went back to the 105's with better results. My reamer is a .094 freebore and a .271 neck. The 109's in it worked ok with 29.2 grains of powder and .015 off the lands at 2760 ft/s 24" 4 groove krieger barrel on an impact. Bug holes at 100, shit at 1000. Test them at distance if you decide to use them.
Yeah I chambered a longer freebore at 113 so I could get the 109 where it needs to be. I will say the 105’s shoot lights out too. 30.2 for 109 and 30 for 105. Almost identical calls.
no the Berger 105s work great. I don’t want to change as long as I can get them.
So, you’re saying you think the bullets are not consistent?
The only way to bug hole at 100 and not at 1k is either
Shooter
Velocity
BC
If you have acceptable ES with chrono, that takes care of velocity (I’m assuming you checked that).
So, are you thinking the 109’s were inconsistent from bullet to bullet? That’s the only way it will shoot well at 100 and not at 1k.
you already know I can’t shoot, since I spend my time at matches wearing white knee pads and bee keeper hats.
all I can tell you is...I went back to 105s with zero issues.
same here the Prometheus is hard at work at the moment.
My experience with the 109’s in a 6 Comet is they like to jump. When I first shot them I was at .020” off with half moa or so groups. After talking to some other guys at matches I pushed them back to .060” off and that was one ragged hole and good at distance as well. I’ve shot them in all 5 of my NRL matches this year and they seem to work just fine.
I would try that area for sure. I’ve set mine at .060” from first rounds down the barrel and haven’t changed it since. That’s over 3 different barrels also.
Find a charge that gives you the speed you want startimg w 0.020 jump then adjust seating depth if needed. Mine usually hammers right there and Im too lazy to tweak.
Find your speed with low SDs and then figure out your depth. I could only get them to shoot 0.00 to 0.010 on my gun for example.
One thing to keep in mind is that you dont want the bearing surface of the bullet to go deeper than the neck-shoulder junction to avoid the whole donut area. Depending on your FB, that may affect where you seat.
Also doing a 6BR build with 28” iBi/New Lapua brass/Berger 109. Would you be kind enough to share what reamer print/specs was working best for such a build based on the above components.
