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Primer question for 243 winchester/115 jlk/n165

 
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  #1  
Old 05-12-2011, 06:15 PM
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Primer question for 243 winchester/115 jlk/n165

I am trying a new load for my 243. I am loading in a winchester case, 115 jlk, with n165 powder. My question is should I use a mag primer or stick with the large rifle primer with this slow powder. I have shot a couple with 44.5 grains of powder and the mag primer and have not seen any pressure signs yet. N165 is a slower burning powder than H1000 I believe. Anyone load this combo or the like? I started off at 44 grains and the large rifle primer.

Last edited by CHARLIEDUECE65; 05-19-2011 at 07:37 AM.
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  #2  
Old 05-12-2011, 07:28 PM
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Re: Primer questions for 243 winchester/115 jlk/n165

I see no reason to use mag primers with such small amounts of powder.

It would seem to be non-productive at best.

JMO
-- richard
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  #3  
Old 05-12-2011, 07:43 PM
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Re: Primer questions for 243 winchester/115 jlk/n165

"My question is should I use a mag primer "

My suggestion is "Try them." It's certain that none of us can tell you how your rig will respond.
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Old 05-12-2011, 08:06 PM
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Re: Primer questions for 243 winchester/115 jlk/n165

For me personally, I use magnum primers for just about everything. I have found that using magnum primers produce the highest velocities and lowest ES and SD's. In some of my 6.5's there is an honest 80 fps difference in velocity from using a 215 vs a 210. Shoot em both, and if they both shoot good, then let your chronograph decide. I bet you will find that your load is more consistant with a magnum primer. Just my .02
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  #5  
Old 05-13-2011, 07:09 PM
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Re: Primer questions for 243 winchester/115 jlk/n165

ok, thanks for the info...I thought it might be necessary to use them with the slow burning powders....I will just keep experimenting and see how they work out.
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  #6  
Old 05-14-2011, 10:38 AM
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Re: Primer questions for 243 winchester/115 jlk/n165

Well, you got 3 answers. All completely different. So, I'm keen to know what you discover.

thanks!
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  #7  
Old 05-16-2011, 02:22 PM
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Re: Primer questions for 243 winchester/115 jlk/n165

I just ran 3 rounds over the chronograph. I loaded 45/45.5/46 grains of n165. All rounds had the cci250 primer. The barrel had been freshly cleaned before this firing. The first round (45) was 2831fps, the second (45.5) was at 2988, and the last (46) was 3007. I'm "guessing" the first rounds slow speed was due to the clean barrel? I'm going to stay at the 45.5 +/- area and check for accuracy. I believe this is around the speed to stick to. This was done in a 25" Krieger 8 twist barrel.
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