What is the feelings on using magnum primers for .270 w/ barnes 130 grain triple shock?

I have always used CCI 250s, Fed. 215s and am going to make up some loads with WW Mag. primers. I prefer 150NPs or BTs or ABs in my .270s, have three now and have had a dozen different ones.

I like RE-22 best in my .270s and have burnt lots of H-4831 as well. Go to Barnes site and use their data to get started, you should have no difficulty in getting a 3000+ fps-mv load with that bullet and some H-4831 plus mag. primer.

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What is the feelings on using magnum primers for .270

I've reloaded for the .270 since 1962.....I've never had a need for anything other than a large rifle primer.

Do as you wish!

I would do what the load books recommend, but if you substitute a mag primer for a standard, back down at least a grain to start with.

I, like Vapo, have never used a mag primer in a .270, and I have loaded for mine and several others for almost 30 years.

One of my favorite primers for loading with my 270 is a WLRM, it is not about velocity, it just seems I get tighter groups. In fact my starting loading for any 130gr bullet is usually 60gr H4831 with a WLRM.

But with that being said, I have numerous loads worked up with WLR, CCI 200, Rem and Fed 210M primers in all the various 270's I have owned over the last 20 years.

Magnum primers may not be "needed" but I don't see the harm in using them.

I picked up a tip from a gentleman that did custom reloading.

He always changed primers when he would get tight groups with a flyer. He felt it was inconsistent powder ignition. I have followed suit and it has served me well while working up loads.

I always liked the idea of using magnum primers in the cold weather we have to deal with during our November deer seasons.

I think it is kind of a six of one, 1/2 dozen the other situation.

I found that groups tightened up quite a bit when I started using Magnum primers. Same goes for my friend's 270. You can only try and see if the results make you happy
rob

Sometimes I get better accuracy from magnum primers with slower powders like the 4831's and slower.

I don't load to max with a .270. A good load has been 58.5gr. H-4831/130 gr. Sierra PH, Winchester LRM primers. I was short on those Win primers and did the same load with CCI-200 and my groups nearly doubled in size.

Sometimes primers can make a difference; you just have to try and see. With the magnum primer you raise pressure more than velocity. Merg

quote:

Originally posted by ceebassman:
What is the feelings on using magnum primers for .270 w/ barnes 130 grain triple shock?

Hello! I see this is your first post. Welcome!

I do not recall ever using a magnum primer for this caliber until I worked up a new "wolf" load in one of my 270s for a spring 2009 hunt. I loaded IMR 4350 and a Fed 215M primer.

To date, it is my best 270 load I've ever had and I've loaded more of this caliber than any other combined for 20 years. I chose a mag primer because I was told to expect up to -40 degrees and I wanted good ignition.

I remember reading in a load manual where an author wrote that the 270 does really well with magnum primers. It sure surprised me in my rifle.

That said, this is the only time I did use a magnum primer but it will not be the last. I'm working on a friend's rifle right now and we have a really good load with H4831SC and I'm going to change one thing: the primer, from a 210M to the 215M and see what happens. We are still below max charge in his rifle. There is also a very close load with H1000. Will change that one to a mag primer also.

One caveat I recall recommended using a magnum primer anytime your powder charge exceeds 60 gr in weight or if you are loading ball powders, especially in cold weather. In my own experience with my .270 WSM, I found the best consistency and accuracy using the standard Federal 210 primer. The Winchester Large Rifle Magnum primer was a close second, though. The powder charge was 65 grains, but then the short fat case may be easier to ignite than a longer, skinny case. My 2 cents worth.

To use mag primers would just make the load go
a little faster and the Volicity would be a little faster.
But if that load is near max it might go over the safe fps.

I think that the Speer reloading manual has Mag primer loads for many different chamberings including those that we normally use only standard primers.
The load developing remains the same, start low and work up with the powder charge.
The end result with mag primers will probably be different from using standard primers in terms of powder charge.

Don

I use CCI 250 Magnum primers in my .280.

It gives me more consistant velocity & better SD W/compressed loads of RL22.

As mentioned, when substituting magnum primers for regular, reduce the loads & work back up.

In the end, there are so many combinations to play with when loading ammo, so whatever shoots best and safest in your rifle, is what you should use.

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Originally posted by ceebassman:
What is the feelings on using magnum primers for .270 w/ barnes 130 grain triple shock?

This is from the QL manual.

“The primer compound produces a stream of hot particles and gas, which (ideally) should simultaneously ignite the entire surface of each granule of the propellant charge and to do so without fracturing any granules. (While such perfectly simultaneous and non-damaging ignition is impossible, the closer the primer flash comes to achieving this goal, the more consistent combustion will be)”.

I guess you won't know until you try it.

Ceebassman, when choosing a primer, it has more to do with the powder you are using, not the bullet. With a stick powder cci200 are hard to beat. If you are using a hard to start ball powder, then magnum primers generally give better results.

While I haven't yet used a mag primer on the .270, I have used it on many other cartridges.....and the criteria I picked is mainly compaction.

IMO the issue of compaction of powder is more appropriate to use of a magnum primer than over whelming volume of powder......to a point.

If the loading data says to use a magnum primer.....I do!....If it says a LR primer....I may substitute a mag primer if I can see that load development may result in a lot of compaction.....and the .270 Win is indeed a candidate for this application as it seems the recommended amount of H-4831 is to fill the entire case and compress the powder by installing the bullet! (130 grains)

I just may review my .270 loads with this thought.

I've only used a magnum primer in one .270 load, and it clearly showed higher pressure compared to a "normal" LR primer. So, should your heart be set on a MLRP, be sure to work up with this combination.

- mike

quote:

While I haven't yet used a mag primer on the .270, I have used it on many other cartridges.....and the criteria I picked is mainly compaction.

IMO the issue of compaction of powder is more appropriate to use of a magnum primer than over whelming volume of powder......to a point.

If the loading data says to use a magnum primer.....I do!....If it says a LR primer....I may substitute a mag primer if I can see that load development may result in a lot of compaction.....and the .270 Win is indeed a candidate for this application as it seems the recommended amount of H-4831 is to fill the entire case and compress the powder by installing the bullet! (130 grains)

+1 on what vapodog said.

In any case from .257 AI and larger, I'll often try magnum primers, especially if it's a full case of slow powder.

Just remember to drop down a grain or two of powder (depending on how hot your load is with standard primers) and work the load up with the magnum primers. Sometimes they are more accurate, sometimes they're not.

Thank you all for your input, that's a lot of info for the "new guy"! I have a buddy of mine that reloads for me and I guess you could say, I am just checking his work. Not really though, I have others that have told me that Mag primers don't make that much difference....The load that I am using is perfect, and have killed many critters! They also make me look very good at the range....
Thanks Again!

quote:

Originally posted by ceebassman:
Thank you all for your input, that's a lot of info for the "new guy"! I have a buddy of mine that reloads for me and I guess you could say, I am just checking his work. Not really though, I have others that have told me that Mag primers don't make that much difference....The load that I am using is perfect, and have killed many critters! They also make me look very good at the range....
Thanks Again!

No problem, if you want a confusing answer to a simple question, we have it on this forum. If you're fishing, there is more than enough people on this forum to take the bait.

I agree with what most have said, but doubly so with the idea that only trying mag and regular primers will tell you which produces the best results.

I also think the length of the case and how much of the case is being occupied with powder (density, to some extent) has something to do with which primers will work the best.

Also, all primers aren't created equal. I once saw photos of the flame/spark field produced by various primers and there was a lot of difference. Some primers produced a longer flame field while others produced shorter, but more dense flame fields, etc. (I couldn't find that article on the internet again, but it was enlightening.) What I'm saying is that some regular large rifle primes might work better than others on especially high volume loads.