I have recently got ahold of a win pre 64 264 win mag with 26"bl and wanna start to work up a good load for it , my problem is one of my reloading books(Hodgdon #26) list two of the powders I have on hand and says to use cci200 primers , and my other reloading book (speer #13 ) list the same powders and same charge (min & max loads ) but says to use cci250 primers witch is corect ?

I'm looking at a new copy of the Speer #14 Manual.

It calls for CCI 250 primers for every load for the 264 Winchester Magnum. That's what I'd use.

quote:

Originally posted by deerslayer64d:
I have recently got ahold of a win pre 64 264 win mag with 26"bl and wanna start to work up a good load for it , my problem is one of my reloading books(Hodgdon #26) list two of the powders I have on hand and says to use cci200 primers , and my other reloading book (speer #13 ) list the same powders and same charge (min & max loads ) but says to use cci250 primers witch is corect ?

At minimum loads, either will probably work fine. When working up to the maximum loads, if you ever bother to use them, you may hit your rifle's "max" earlier if using magnum primers instead of the standard ones. The operative word here is MAY.

When attempting to use maximum loads, I would recommend you use use the brand and type of primer your data was developed with. In Speer books that is almost always CCI primers, as CCI and Speer are the same company. With lower loads, almost all primers of the correct size for your cases will interchange safely.

what I normaly do is , lets say the book list 52 gr of imr 4831 as a min load and 56gr as max load I will start at 52 gr and load 1/2 gr advances intill I get to 56gr with three shells for every advancment and fire them seeing witch one my gun likes best and stick with it ! it just threw me cuz the books listed different primers for the same load

Use any magnum primer and work up.

Many books don't call for the magnum primer......but one can be used even in cases as small as the 6mm Remington.....just work up as always!

I would try both. The magnum primer might be equivalent to 1 to 2 grains of powder so, as others have said, work up watching for pressure signs.

quote:

Originally posted by Grumulkin:
I would try both. The magnum primer might be equivalent to 1 to 2 grains of powder so, as others have said, work up watching for pressure signs.

Grumulkin is correct....in fact in the old days many reloaders were taught a rule of thumb by some loading books which said something like "magnum primers = 2 grains of powder".

It isn't necessarily true, but it ain't necessarily wrong, either!

One other good reason for trying both kinds of primers is that for reasons we just can't always predict, sometimes using a standard primer produces the best accuracy in a specific rifle, while magnum primers will give the best accuracy in another rifle. One never knows which will work the best until he tries them both. Just be careful not to make the switch to magnum primers in maximum loads without dropping your powder charge back down and working up to max again!