I am currently using WW small rifle primers and new Starline brass. Would the use of mag primers tighten up my groups? When I see horizontal I think it's usually shooter or something weaving the barrel horizontally, trigger pull, palm push, etc.
Vertical usually means MV changes. The reason for the use of magnum primers is the floating firing pin in the AR The magnum primers and many match primers have thicker primer cups which resist slam fires. I was fighting horizontal stringing in the Spring and it was related to not having a consistent and relaxed grip. Correct answer. My groups at yrd got tighter, mine and my wife's scores at yrds. I was researching why most everyone was using CCI 's and if it might be detrimental to accuracy.
Lemon, 's have thick cups which resist the unintentional impact of free-floating firing pins. This can get interesting. But here are a few quotes from my 49th edition Lyman manual; page The correct primer choice is listed in the data section for each specific cartridge.
Unquote From page 57; Quote For example: In one primer test, extreme velocity variation was an excellent 38 fps. With another brand primer, the extreme velocity variation was a poor fps.
Pressure comparisons for the same test loads showed spreads of as little as psi with the first primer and a very poor psi with the second primer. Unquote Quote Nonetheless, it is not possible to state that one specific primer does a better job than another. A given primer might perform poorly with a specific load in one caliber, satisfactorily with a second load in another caliber and outstanding with a third load in still another caliber.
Go by what primers "are listed",,,but also try different brands of primers to see what works best. Joined: Aug Posts: 1, idaho 1 Campfire Ranger. Aim for the exit hole. Joined: Jun Posts: Vermont U. O oneoldsap Campfire Regular. Originally Posted by shrapnel I probably hit more elk with a pickup than you have with a rifle. At one with the gun. I changeover to magnums when the load reaches 70 grains. Joined: Nov Posts: 4, 1 Campfire Guide. Switch to Threaded Mode.
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Gear Reviews. Movie, Book, and Music Review. Another rule of thumb suggests the use of magnum primers to combat sub-freezing temps, but what effect does cold really have? Perhaps I'll load up a batch of cartridges identical to those in this test, wait for a below-zero day this winter and find out. Give a Gift Subscriber Services. See All Special Interest Magazines.
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