Primer question for 243 winchester/115 jlk/n165

[CHARLIEDUECE65]

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.

 

[rscott5028]

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

 

[boomtube]

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.

 

[Shooter264]

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

 

[CHARLIEDUECE65]

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.

 

[rscott5028]

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!

 

[CHARLIEDUECE65]

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. gun)

 

[rscott5028]

Re: Primer questions for 243 winchester/115 jlk/n165

Sounds good.

Let us know how the accuracy compares after you've fired enough shots with each primer to make an assessment.

Have you tried CCI Benchrest or Federal or Match primers?

-- richard

 

[Reloader222]

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. gun)

The extreme spread is too big. You need to fine tune the loads. The best is to load equivalent loads with the different brands and look for the variable in fps, Extreme Spread and Standard Deviation. My experience is also that the SD is lower with Fed215 primers than with other standard primers.

 

[CHARLIEDUECE65]

Re: Primer questions for 243 winchester/115 jlk/n165

Yes I'm going to do that...I was looking initially to find the fps area I'm trying to attain, then I will resume my testing. I only have 1 pound of this powder so, I will see how br2/wolf primers work at the area the cci250 is working in the velocity area I'm looking for. Thanks. As far as the spread are you talking about the first shot being off so far?......I've noticed this with other guns with clean barrels the first round is always aways off on the fps. My cleaned barrels has a patch of butchs oil ran through it and then a dry patch ran through it before firing. Maybe this is the problem? When I was testing 107sierra/105 amax's I was having a hard time getting velocities up to and over 3000 fps with several powder/large rifle primer combos using less than 45 grains of powder. gun)

 

[rscott5028]

Re: Primer questions for 243 winchester/115 jlk/n165

Sounds like a work in progress...

1 round each from 3 different loads is practically worthless except to confirm that pressure isn't a major concern. Chrony error, case capacity, chamber termperature, clean/fouled barrel, will all skew the results.

You seem to be working backwards from everything I've learned. I suppose you may end up with the same results eventually.

But, I would pick one combination of quality components and do a ladder test to find accuracy nodes. Then, pick the accuracy node that best meets my expectations for velocity and run more samples to validate that the accuracy node wasn't just an accident.

-- richard

 

[CHARLIEDUECE65]

Re: Primer questions for 243 winchester/115 jlk/n165

You're right, the three rounds I loaded initially were to see if pressure was going to be an issue in the 2960-3000 fps area. I did this at home , not at the range, and shot into a dirt pile through the chronograph. I am going to start testing 5 rounds at 44 grains with the CCI 250 primer and work my way up to 45.5 grains. I might try the large rifle primer if I'm not having good results. Yes, it is a work in progress. Initially, I didn't want to test the difference between the primers, as I was hoping to avoid doing this. Maybe, I should have just tested this myself and not asked. I was hoping to get some free, first hand, knowledge, or experience. My question was do you "NEED" to use magnum primers with slow burning powders....I asked this to save me the time of testing and I also wasn't sure if you get a complete burn with this slow of a powder and large rifle primer.

 

[rscott5028]

Re: Primer questions for 243 winchester/115 jlk/n165

nothing like 3 contradictory answers from 3 anonymous internet experts to solve all your problems

 

[CHARLIEDUECE65]

Re: Primer questions for 243 winchester/115 jlk/n165

I hear Ya!