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-   -   primer ? (http://www.huntchat.com/showthread.php?t=46668)

gordon baxter 01-26-2008 07:45 PM

primer ?
 
Hi there i have been loading my 270 and 300 mag for years with rem 9 1/2 mag primers and could not get them were im at and got cci large mag primers wondring if they will change my impact point enough to make a difference? Rifles are hunting only. Thanks

Dan Morris 01-26-2008 08:02 PM

Gord, the impact points and groups are definitely gonna change, More important.... pressures are gonna rise! Check your
loading book with charge v/s reg and mag primers...be safe, do not get into trouble!
Dan


BTW...lets hear more from you...you've been a member for a while...get active with us!
:)

Gil Martin 01-27-2008 06:12 AM

It depends
 
I agree with Dan, when you change components it is best to revisit the reloading manuals and work up a safe load. How much will the point of impact change may vary so a trip to the range is in order. All the best...
Gil

Jack 01-27-2008 06:52 AM

Gordon, if I am reading it correctly, you're changing from one brand of magnum primer to another brand of magnum primer.
Just to be safe, I would cut your powder charge 3 grains or so, and work up again. Consult your loading manuals as a reference, too.
My guess is that once you've worked up to the same pressure level with the new primer, point of impact change will be minimal.

denton 01-27-2008 01:52 PM

Not to be crossways with anyone, but...

I have run tests of magnum vs. regular primers, and of Federal and CCI primers in the 243, the 7.62x54R, and the 30-06. In no case did I find any difference in measured peak pressure.

There is a reason the 50 BMG uses a big primer.

But on rifles 30-06 and below, I have searched in vain for a measurable difference caused by primer type.

Jack 01-27-2008 04:49 PM

Denton, I agree with you.
For Gordon, maybe using the same priimer in 270 and 300 Mag saves stocking 2 primers.

Catfish 01-28-2008 07:19 AM

There is reall no way to tell what the presure is going to be till you try, but it could jump a bunch. I ran some primer test with in my .22-6mm with H-870 powder and fired different brands of primers in both regular and mag. I got less than 100 fps. varation between all of the primers. In the same rifle with Mag. Pro powder I switched from Win. mag. primers to Fed. match mag. and the velosity jumped over 200 fps. and the presure became excesive. 1st. rule, be safe.

dakotah 02-06-2008 09:13 AM

Primer shortage is becoming a problem in many areas. Changin components can change pressures. I have not seen this regarding primers as much as cases and bullet manufacture though. I suspect you won't see much difference. However, I would also reduce the load and work back up again. I would do this with change of brass or bullets also.

gordon baxter 02-07-2008 09:14 PM

Thanks everyone i think i might just wait for order of rem primers to come in and buy lots then i will be for a while.


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