Primer experimenting: they do make a difference

[bfoosh006]

Ronas, you need a copy of the Dec. '08 Handloader magazine. MASSIVE .308 reloading test.His rifle.... Sako TRG-22. They still have it available. Do your self a favor and order it.

http://www.riflemagazine.com/backissues/index.cfm?type=0

Darn near the bottom of the page..... Handloader Dec. '08

[thomashoward]

I noticed with my reloads Fed 210 have better accuracy and WLP had higher velocity but not by much.

[huckberry668]

Ronas, you need a copy of the Dec. '08 Handloader magazine. MASSIVE .308 reloading test.His rifle.... Sako TRG-22. They still have it available. Do your self a favor and order it.

http://www.riflemagazine.com/backissues/index.cfm?type=0

Darn near the bottom of the page..... Handloader Dec. '08

Can you summarize for us the conclusion of the article? Much appreciated if you can.

[mjmagee67]

I have used Winchester and CCI interchangeably in 30-06. Same brass, some load, same OAL equaled same POI. But the Winchester primers did flatten out way more than the CCI.

[huckberry668]

did some searching and found a few...

http://www.calguns.net/calgunforum/showthread.php?t=95308

Conclusion - Winchester primer best value.

http://www.accuratereloading.com/primer.html

looks to me various primers matter not much in terms of accuracy.

http://riflemansjournal.blogspot.com/2009/06/primers-small-rifle-primer-study.html

http://riflemansjournal.blogspot.com/2009/06/primers-large-rifle-primer-study.html

[bfoosh006]

Can you summarize for us the conclusion of the article? Much appreciated if you can.

The author, Gary D. Sciuchetti, uses a Sako TRG-22. His quick summary is as follows....


QUOTE....

Changing the powder charge weight altered group size up to .75 inch ( Using Varget )

Changing the brand and type of Primer can alter group size by .313 inch ( Using all commonly available brands. )

Changing the the Brass case brand ( whether virgin or once-fired and neck-sized only ) can change group size up to .25 inch. ( Using all commonly availalbe brands, 10 different )
He also does a "Brass Endurance Test" reloading the cases to failure.

Changing brands and styles of bullets altered group sizes up to 2 inches. ( He used 165gr -168gr weights of bullets , 32 different ones. )

The seating depth of a solid copper bullet is critical, different depths changed group size by 3 inches.


No offense to anyone....I will not give more detailed info , as the author deserves all the glory for the article. Buying a copy of the magazine is the only fair thing to do, he spend a ton of time doing all the testing, not to mention ... if we don't support these magazines.... we probably wouldn't even see testing like it. It truly is full of info.


That said..... get a copy. It is excellent information and reading.

http://www.riflemagazine.com/backiss...dex.cfm?type=0 ...
darn near the bottom of the page. Handloader, Dec. '08 issue. The Issue costs $10 bucks plus shipping. Honestly it was worth every penny to me.

[huckberry668]

The author, Gary D. Sciuchetti, uses a Sako TRG-22. His quick summary is as follows... .

Thank you!

[ronas]

Thank you too, I plan on ordering a copy, seems like some interesting material.

[bubbapug1]

A test of primers can't be done if the brass isn't the same. Using small primers and large primers change the results. Different brands of brass also. For your tests to mean anything to you, all your components have to be the same. I have tested small pistol and large pistol primers for 45acp. With same bullets and powder, I get over 100 fps faster with small pistol primers. I was shocked at how much difference.

Agreed, the brass could have a 5% internal volume difference, ho was the wind blowing, etc....

While the test is good to some extent, there are significant variables present which render the results inconclusive....especially the 3 shot groups.

To really be statistacally close you would need matched brass, individually weighed charges, no crimps, 5 shot groups in similar wind conditions, bullets from the same die, etc. I also think velocities should be taken to take the group thing out of the equation as that could be shooter related. Velocities would be more a correlation to ignition rate and pressures than group soze, thats about 5 or 6 variables and steps down the food chain.

In any event, primers do matter....perhaps there is a more direct way to determine their relative hotness.

http://riflemansjournal.blogspot.com/2009/06/primers-large-rifle-primer-study.html

What

[Fjold]

ronas, do you shoot at Palmetto Gun Club?

[ronas]

Yes I do.