Primer question...standard srp

[kd4avp]

Still have about 900 BR4 primers left. What is others experience in using standard primers in a bench rest cartridge such as a 6br?
For example, substitute a No41 primer or regular Winchester primer.

 

[powderbrake]

After all, benchrest primers are standard primers with extra quality control, or those made by particularly skilled employees.

With the primer situation being so bad, I suggest you try some other primers, and test for yourself.

 

[Deleted member fkimble@charter.net]

Do some online research. Some primers have thicker cups than others. Thicker cups are less prone to piercing/leaking especially if running hotter loads in 6PPC and 6 Br. Do a search for primer thickness chart. That will get you started.

Frank

 

[divingin]

I normally shoot standard SRP in my 6BR. I started with BR4's but changed when I couldn't find them. I haven't noticed any difference in groups or anything. I'm not trying to win matches though; YMMV.

 

[SecondsCount]

From what I have read, BR4 primers have a thick cup, so keep that in mind when substituting something else.

I've had some very consistent results with Federal 205 primers in 223 loads but I have never tried them in 6BR. Around here nobody spends the extra money on BR4 primers so they are usually on the shelf, or people want to trade them for regular SRP primers so they can use them in their AR. Many of them don't realize that either will work fine

 

[divingin]

From what I have read, BR4 primers have a thick cup, so keep that in mind when substituting something else.

Good point, and I probably should have mentioned that. I shoot mostly 100 yds, as there aren't any other ranges that let me reach out within normal driving distance. I also tend to shoot fairly mild loads (comparatively.) So pressure is not an issue for me, normally.

 

[Flouncer]

This is Grafs' chart - https://www.grafs.com/uploads/technical-resource-pdf-file/12.pdf

 

[mike a]

In my 6BR at 600 the wind doesn’t care which primer I use.

 

[foxguy]

In my 6BR at 600 the wind doesn’t care which primer I use.

If I may ask what Bullet, Powder, and Load are you using?

 

[Chiquita]

Sorry I don't have specific answer to your question but want to share this as well.

You are being redirected...

 

[KMart]

If you have a quantity of Winchester primers, work up a load with them. They are not my "go to " primer but I have worked up loads with them and they shot very good. They may surprise you too.

 

[mike a]

If I may ask what Bullet, Powder, and Load are you using?

Peterson, Varget 29.ish, 105 Hybrid, CCI 450, .005 jump. But Fed GM205M and BR4s work also.

 

[klamathsteel]

Peterson, Varget 29.ish, 105 Hybrid, CCI 450, .005 jump. But Fed GM205M and BR4s work also.

That's a damm good target !!

 

[D-4297]

Since the 41's are a Mil-spec primer with a thicker cup , to counter slam-fire in Military Auto-feeds , they should be more than suitable , if you're currently using BR4's .

 

[Mikemci]

I always used BR-4 in my 6PPC, then I tested 5 different primers. Turns out, my best group was Federal GM205M.
You just have to test, if you want to know.

 

[Dave M.]

Still have about 900 BR4 primers left. What is others experience in using standard primers in a bench rest cartridge such as a 6br?
For example, substitute a No41 primer or regular Winchester primer.

In the 6BR and 6 Dasher, I personally have experienced the lowest ES abd SD with CCI 450’s
And a close second were the Winchester #41’s.

 

[kd4avp]

Thank you all for the input. Doing as suggested and loading some up with milspec primers to test. Have a good supply of those and Winchesters so testing will be done. I am primarily a CMP rifle shooter prior to getting into the benchrest game recently. Many of my supplies lean toward that type of reloading. Good selection of powders on hand to choose from although would like add more Varget and 4895 when possible.

 

[kd4avp]

Sorry I don't have specific answer to your question but want to share this as well.

You are being redirected...

Excellent info article. Thank you so much for the link

 

[Rsadams]

If you're asking if it will hurt anything , the answer is no.... If you're not loading a max charge just substitute your new primers and go test.... For extreme accuracy you will probably have to work up a load... For practice I doubt you will have to do anything.... Of course check your first rounds for pressure or problems...

 

[Dave M.]

Thank you all for the input. Doing as suggested and loading some up with milspec primers to test. Have a good supply of those and Winchesters so testing will be done. I am primarily a CMP rifle shooter prior to getting into the benchrest game recently. Many of my supplies lean toward that type of reloading. Good selection of powders on hand to choose from although would like add more Varget and 4895 when possible.

Lol. Wouldn’t we all. Varget is hard to find, but if you are willing to give up a kidney or cornea, you can usually find a 8lb keg for about $350.