Hello gents.
I´m sure this must have been discussed a dozen times, but I did not have any sucess with my search.

The question is about the need to use magnum primers in the good old 375 H&H.
My loading manuals says wery little about it, but most of them use standard primers.

In the book "Big bore rifles and cartridges", gun guru Bob Hagel advocate CCI 250 primers wich is as far as I know, magnum primers ?

Is there any advantages using magnum primers for hunting in normal temperatures and with standard/premium 270 and 300 bullets ?

For many years I have used standard primers without a single hickup in the 375, from freezing cold to pretty hot RSA temperatures.
But as a reloader, one is constant on the search

Arild,
I use magnum primers only because I'm afraid that some day I'll discover that there is a difference!

Frankly, I'm not at all convinced there's any difference in standard and magnum primers!!!

Magnum primers aren't at all hard to find so I use them.....but I'm not sure why!

So far, I've only used the CCI 250 large rifle magnum primer to reload the 375 H&H Magnum. I've heard, however, that better accuracy may be obtained with the plain large rifle primer so I intend to try them at some point.

When I began loading for the .375 H&H I assumed that it would be better with magnum primers, and I made my first loads using Federal 215 ones. But someone from Hodgdon advised me that non-magnum primers are a better choice for this cartridge. So I now use the Winchester Large Rifle primer (WLR), which is, I understand, one of the hottest of the regular (non-magnum) primers, and I get excellent results with it, in terms of both accuracy and velocity, in the .375 H&H, even when I use compressed loads of H4350.

Most of the difference in "maganum" and "standard" primers is in the label and the price. Your .375 H&H typically uses powders in the medium burning range which aren't particularly hard to ignite, anyway. I doubt that you'll see any improvement by switching to a "magnum" primer, but then you'll probably see no detriment either.

Some manufacturer's "standard" primers are as hot or hotter than other manufacturer's "magnum" primers. I would guess that the WW WLR has approximately the same briscience as the CCI 250 (and both are good primers.)

just what vapodog said

In terms of powder capacity, the H&H isn't really a magnum-at least not when compared to the 375 Wby, 378 Wby, 375 RUM, et cet. I bought the CCI250s because that's what the Barnes manual used in their loads.

LWD

There is a difference is Mag. and standard primers!Thats why they make them!Mag primers are made for more ignitiion in the slower buring powders of the Magnum cartridges.If you use Mag primers in a standard cartridge,it is best to cut down your powder load by 10% and if thaere is no signs of pressure then you can load more powder. Myself and others i shoot with use mag. primers when bench shooting our 223,s and there is an appericablae difference in cartridge preformance.I always use mag primers for everything,just watch my loads,as i went the best ignitiion of that powder possible. van

Thank you guys.
I think I will load a batch with the CCI 250 and Hornady 270 grainers just for a try (the famous reloaders curiosity )
But I guess I will as van suggest, start a little low.
I also had a quick look see on Saeeds primer test, and the CCI 250 did pretty good regarding group size.