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SR Primers

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13 July 2006, 05:39
Horn-Harvester
SR Primers
Any of you seen any difference in velocity between Remington 7 1/2 and CCI BR-4 primers? Im having a hard time finding 7 1/2 but ive found lots of BR-4.
13 July 2006, 05:53
308Sako
In all the years of chronograph many 100's of different loads I would have to said yes there is a difference, but usually quite minor, and never totally predictable as to which is going to be faster.






Member NRA, SCI- Life #358 28+ years now!
DRSS, double owner-shooter since 1983, O/U .30-06 Browning Continental set.
13 July 2006, 06:37
craigster
It is my understanding that the Rem 7 1/2 BR primers are a magnum primer which could result in higher veocities and/or pressures. I use them almost exclusively for my SR applications but have never compared differences between them and other primers with a chronograph.
14 July 2006, 11:36
georgeld
Seems I read some place the difference was in the length of time the flame was burning from primers.

Unless I'm mixed up and that's the diff between pistol and rifle primers.

From the mixng and matching on plinking stuff I haven't noticed any difference, but, since a patch hit the face of that sorry assed chrony I haven't replaced yet. So cant' say about the diff in vel.

George


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George L. Dwight
14 July 2006, 20:28
VarmintGuy
Horn Harvester: I use the wonderful Federal 205 M Bench Rest primers - exclusively - in my small Rifle applications.
Its been so long since I tested these against the others that I forget the differences specifically but I do know they produced the best accuracy and are quite consistent from year to year - decade to decade.
Good luck with whichever you choose but please be sure to try the Fedral 205M's.
Hold into the wind
VarmintGuy
14 July 2006, 22:24
30378
Without a doubt, in my Remmy PSS 223 there is a differnce in accuracy with the CCI BR primer being a more accurate primer. Not sure because it is BR but just one over the other, give me the CCI BR. The Federal 205m is also a good primer but in certain batches the cups tend to be thin.


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15 July 2006, 04:39
Horn-Harvester
thanks for all the info. h.h.