Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
carlos69, R Lawton, Valdo, Cake, TheGoldenGoat
62847 Registered Users
Top Posters
dogcatcher 83737
stxranchman 52093
RWH24 44568
rifleman 44296
BOBO the Clown 42910
bill oxner 41789
BMD 40619
Big Orn 37484
txshntr 34923
sig226fan (Rguns.com) 31422
facebook
Forum Stats
62847 Members
46 Forums
440548 Topics
6067134 Posts

Max Online: 16728 @ 03/25/12 08:51 AM
Topic Options
#6528357 - 11/05/16 07:43 PM LRP's vs. SRP's and Accuracy
mikei Online   content
Veteran Tracker

Registered: 11/16/14
Posts: 2164
While getting ready for this year's deer season, I did some pretty extensive testing with primers of different sizes. My most notable "discovery" was that my AR platform 7.62 X 39 would shoot MOA+ a little with LRP's of all kinds, but when I tried SRP's of different kinds, my groups shrank noticeably! I mean from MOA to ragged, one hole groups of 5 shots at 100 yards. I've noticed differences before when I changed primers (and brass, obviously) but never remember seeing such a dramatic difference. Have any of you reloaders seen really big differences in accuracy by going from large to small rifle primers?

Here's a good review of primers from Precision Rifle, but it doesn't really answer my question:
http://precisionrifleblog.com/2012/07/02/most-accurate-rifle-primers-for-precision-reloading/


Edited by mikei (11/05/16 07:47 PM)

Top
#6528635 - 11/06/16 06:30 AM Re: LRP's vs. SRP's and Accuracy [Re: mikei]
dee Online   content
THF Trophy Hunter

Registered: 04/10/10
Posts: 5089
Loc: Red River way
I've seen sd's lower but that also could be from brass quality as well.
_________________________
"A vote is like a rifle; it's usefulness depends on the character of the user" Theodore Roosevelt

Top
#6529014 - 11/06/16 12:43 PM Re: LRP's vs. SRP's and Accuracy [Re: mikei]
mikei Online   content
Veteran Tracker

Registered: 11/16/14
Posts: 2164
I found an interesting reference to small primers on the 6MMBenchrest site. They were doing an in-depth review of the 6PPC:

The small flash hole/primer accounts for much of the 6PPC's superior accuracy, though nobody really knows precisely how or why. The "short, fat" shape and nearly straight body contribute to efficient, consistent combustion and good "chamber behavior".


I wonder how/why they can say that "the small flash hole/primer accounts for much of the 6PPC's superior accuracy," and then, in the same sentence, say that nobody knows how or why!


Edited by mikei (11/06/16 12:46 PM)

Top
#6529088 - 11/06/16 01:51 PM Re: LRP's vs. SRP's and Accuracy [Re: mikei]
papa45 Online   content
Tracker

Registered: 05/14/07
Posts: 593
Loc: Arlington
Forgive me for getting a little off-topic. I know different brands of 7.62x39 brass use different size primers. Which are LRP and which are SRP? Thanks.

Top
#6529169 - 11/06/16 02:59 PM Re: LRP's vs. SRP's and Accuracy [Re: mikei]
mikei Online   content
Veteran Tracker

Registered: 11/16/14
Posts: 2164
Not off topic, papa45! My Remington/Peters cases are small primer; my FC, Fiocchi and Winchesters are all large primer. I also have a handful of miscellaneous head stamped brass that I've picked up over the years, but they're all large primer as well.

Top
#6529249 - 11/06/16 03:36 PM Re: LRP's vs. SRP's and Accuracy [Re: mikei]
dee Online   content
THF Trophy Hunter

Registered: 04/10/10
Posts: 5089
Loc: Red River way
My sd drop was noticed when switching from win 308 to lapua palma. The palma is a srp but with a ppc flash hole..... I remember some time back reading an article on it by either the AMU or 6mmbr guys (likely Mr Salazar) but it talked about the srp being more consistent in ignition.
_________________________
"A vote is like a rifle; it's usefulness depends on the character of the user" Theodore Roosevelt

Top



© 2004-2016 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide