6br primer choice

[chris308]

Am shooting a 6br,1-8" twist.Am messing with the berger 95vld`s and the 107mk`s.My powders are v-v n140 and n150 with excellent results.
After reading many posts on this combo,it didn`t take long to see that the norm was Varget/cci450 mag combination.The guys shooting the 1-14" br`s/68gr fb`s/v-vn135 use fed 205m`s,such as myself)
Is the hotter magnum primer preferred because of some kind of coating on varget?
In my v-v powder/bullet combos,i`ve tried both primers with the same results but use the 450`s "just because" everyone else is doing it.
Am just curious on this,thanks in advance....

 

[Wild_Bill]

In heavy bullets with the br cases and 223 cases i use CCI450's Rem 7 1/2 or PMC small Rifle Magnum primers. I have found that there is a verry large rearward pressure into the primer pocket that occours and by having a primer with a thicker cup stops the primers failing. I have tested primers in the 6mmBR and 223 with the heavy bullets and these are the best three primers to hold the pressure. The other reason is with the heavy projectiles you are usualy running case fulls of slow burning powders for the case capacity and the hotter primers help with consistant ignition. In a 6mmBR with short barrels 26" or shorter H4895 works well and barrels 26" and longer Varget works verry well with the 105-107gr projectiles. There are lots of other combinations that work but i have had good results with these.

If Varget and CCI 450's work well in your barrel dont wory about looking for other options as the 6mmBR is one of the easiest calibres to get shooting with the 105gr projectile range in an 8 twist barrel they just work.

Cheers Bill
Australia

 

[dreever]

Lynn suggested to me over a year ago to switch primers to lower my E.S. I switched from CCI BR4 primers to CCI 450's using Varget and my E.S. was cut more than half. I think the 6BR Varget combination really prefers the 450's.

Danny

 

[eddief]

I also shoot Varget in my 6br, and with the everything being the same except a primer change, the CCI450's printed 5 shot groups that were a 1/3 tighter than with the BR4's on average. This is of course with my gun. Yours may be totally different. For the price of 100 primers, shoot and compare your choices and keep good notes. With good notes your gun will tell which it prefers. CCI450's will definitely handle the higher pressures better.

Eddie Fosnaugh

 

[chris308]

Ok,so it`s a high pressure/heavy bullet thing and not a coating Hodgon puts on Varget.
The reason i wondered is i read that there is a special coating on "ball" powders and magnum powders almost always work better. thanks for input....chris

 

[flatlander]

I've used both BR4s & 450s, with both Varget & N150 in my Dashers. Actually, my two Kriegers prefer R 7-1/2s to either - haven't shot enough formed cases through a Broughton to have a preference there yet. One thing that could be a factor is that the 7-1/2s I have are fresher by at least a couple of years than either of the CCI primers. Even though I store them in the basement, and my house has A/C, and I live in one of the driest areas of western Kansas, it's possible that humidity has caused some deterioration. At any rate, the 7-1/2s typically give single digit ES & SD numbers with N150, along with very fine accuracy, so I've had no reason to switch.

 

[GermanS1]

Having a tragic history with chronographs, I'm reduced to picking primers by how they perform on paper. In my 3 6BR rifles, the Remington 7 1/2 has consistently been the worst performer. The CCI BR4 and the Federal 205M are always neck and neck in scores. This weekend I shot a 500 yard 60 shot match,prone, irons) and had a 600-45X,personal best) using the F205M. That kind of says it all for me - I know what will be in my cases from now on! The rest of the load was 30.0 Varget, Lapua 105,moly), Lapua brass. Again, I don't know the velocity, but it's low, the cases had soot all the way down the shoulder and the primers retained all of their edge radius. My lot of Varget,922034114) is very slow.
German Salazar

 

[jb1000br]

Having a tragic history with chronographs, I'm reduced to picking primers by how they perform on paper. In my 3 6BR rifles, the Remington 7 1/2 has consistently been the worst performer. The CCI BR4 and the Federal 205M are always neck and neck in scores. This weekend I shot a 500 yard 60 shot match,prone, irons) and had a 600-45X,personal best) using the F205M. That kind of says it all for me - I know what will be in my cases from now on! The rest of the load was 30.0 Varget, Lapua 105,moly), Lapua brass. Again, I don't know the velocity, but it's low, the cases had soot all the way down the shoulder and the primers retained all of their edge radius. My lot of Varget,922034114) is very slow.
German Salazar

German, though i dont have the same history,but my dad does ) i'd rather see the vertical performance on paper as well, just chron to get an avg velocity...

BTW -- did my email attachment come thru??

JB

 

[GermanS1]

JB, yes, vertical is what I'm looking at too. On that 600-45, the X's were almost all in a 2" vertical spread. I got a big smile when I went to the pits and saw the target!

I didn't get an email, try gasalazar@att.net
thanks,
German

 

[jb1000br]

1/3moa at 600 will do it

email resent...

THanks,
JB