BS LIST-PRIMER CHOICE

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  • Last Post 09 August 2018
joeb33050 posted this 09 August 2018

 

L Primer choice

 

Primers affect pressure, we have some data on that. My Jacketed Bullet Test data on primers is messy at best, and far from conclusive. My experience is that primer choice may affect accuracy, but the effect is small; so it’s in “List 1”.

 

 frnkeore:” I try several primers with everything I shoot and after 36 years of competitive shooting, I KNOW that they make a difference with many powders but, some powders are not sensitive to primes, such as 4227. Many ball powders that I have used are.”

 

Tom Acheson: “In each of the past and present chambering’s that I’ve had on my XP-100, I tried both the FC 205M and R-P 7 1/2 small rifle primers. In each comparison, the Remington primers shot smaller groups. The differences were not huge but enough that I decided on the primer that I did. These chamberings include 30 BR, 30 PPC, 30 Silhouette and 6.5mm TKS. Powders included Vit., RE-7, SR 4756, 4198, 5744, 4166, and SR 4759 and few others I can’t immediately recall.

 

Jumping over to BPCR with black powder, I tried the  FC 210M, FC -150 large pistol and CCI BR-2. All testing was conducted @ 200-meters, off the bench. Groups were 10-rounds. After all the testing and several Scheutzen match entries, I’ve concluded that THIS rifle and brand/grade of black powder preferred the CCI BR-2 primers.”

 

Jacketed Bullet Test data on primers-223 Rem. This is for ALL groups shot, with 3 jacketed bullets, some cast bullets, and 7 different charges of powder with each jacketed bullet.

 

            IFFLAND                   STEVENS      M12 OLD                   SUM

       AVG” #GRPS            AVG” #GRPS AVG”  #GRPS           AVG”  #GRPS

 

 

 

CCI     1.123   82                    1.108   110      1.006               42        1.095   234                 

 

FED    1.627   58                                            1.305               5          1.602   63       

 

WIN    .895     19                                            1.125               6          .950     25

 

                                                                                                            1.183   322

 

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frnkeore posted this 09 August 2018

Very limited testing, indeed but, still a increase in accuracy of 82%.

There are worse primers than those three and better primers, also. The primer types, within those brands, can also make a difference, sometimes a big difference.

i.e. Rem 1 1/2 and Rem 7 1/2. But, the Rem 1 1/2 will work better than the 7 1/2 with BP and 4759.

There is lots more to primer selection, than just going to the store and buying what's currently on the shelf.

Frank

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RicinYakima posted this 09 August 2018

I've never be able to quantify these tests. For me it seems more like blind luck, I find one that works with one load in my target rifle, and keep using it. Since I normally buy 5000 in a case, that is not a problem for me. Been shooting the same lot of primers for almost 20 years in the 1903. Plinkers, if it goes bang that is good enough.

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