Forums.NitroExpress.com

Home | Ezine | Forums | Links | Contact NitroExpress.com: magnum primers for the 9.3 x 74R

*** Enjoy NitroExpress.com? Participate and join in. ***

You are not logged in. [Login]

Main Index · Search · Active Topics
New user · Who's Online · FAQ · Calendar

Double Rifles, Single Shots & Combinations >> Double Rifles

Pages: 1

DDouble
.300 member

Reged: 17/02/06
Posts: 127
Loc: Brazil

magnum primers for the 9.3 x 74R
#316845 - 27/05/18 11:43 AM

I am using 64 grains of IMR 4350 and soft woodleight bullets for my little Chapuis.

Any advice on changing from Large Rifle to Magnum primers?? I will use 215 Federal.

Anyone has a load with magnum primers for the 9.3 x 74R that works well.

Thanks,

Post Extras:

albertan
.333 member

Reged: 13/06/06
Posts: 432
Loc: Alberta, Canada

Re: magnum primers for the 9.3 x 74R [Re: DDouble]
#316847 - 27/05/18 01:43 PM

In the Woodleigh manual they state: "Standard force primers are recommended for ignition."

YMMV.

Post Extras:

DDouble
.300 member

Reged: 17/02/06
Posts: 127
Loc: Brazil

Re: magnum primers for the 9.3 x 74R [Re: albertan]
#316849 - 27/05/18 02:01 PM

Seen those in a couple manuals.

Unfortunately I don't have them!! here in the tropics it may take 3 months before the army releases my ammo imports.

Post Extras:

mauserand9mm
.400 member

Reged: 03/09/09
Posts: 1040
Loc: Queensland, Australia

Re: magnum primers for the 9.3 x 74R [Re: DDouble]
#316851 - 27/05/18 07:30 PM

Shouldn't make a huge difference. Would be wise to drop a couple of grains and then work up but I think you'll end up at the same load.

I've had to go to magnum primers in the past for various cartridges and I've ended up with the same loads. The magnum primer is supposed to give a longer duration hotter flame and not necessarily increases pressure but it is safest to drop back and work up.

Post Extras:

93x64mm
.416 member

Reged: 07/12/11
Posts: 4200
Loc: Nth QLD Australia

Re: magnum primers for the 9.3 x 74R [Re: mauserand9mm]
#316872 - 28/05/18 08:22 AM

DDouble, if you are right at the top load for your 9.3x74 drop 3 gns of powder before changing over to a magnum primer.
It is a pain in the bum to redo all your loads again, but it will get you by!
I tried with my 9.3x64mm to see if it would improve grouping & it uses AR2209, (very similar to IMR4350) only standard primers were required to set of the charge!
After a load of testing frankly it didn't achieve better grouping, just marginally less powder was used in my rifle so I reverted back to my 'standard' load!
Don't be put off, it may be a better load than you already have - but watch for pressure signs as normal practice

Post Extras:

paradox_
.375 member

Reged: 12/05/07
Posts: 645
Loc: Australia

Re: magnum primers for the 9.3 x 74R [Re: 93x64mm]
#316874 - 28/05/18 08:47 AM

The debate over wether Magnum primers have any effect ( good or bad) over standard in " Standard" cartridges is a long one.
In my experience the difference is not perceivable .
They are of course recommended for long columns of the slower powders.
Whenever you change a component, start low and work back up, but I doubt you see any difference at all.

Best

--------------------
Walk softly and carry a big stick

Post Extras:

DDouble
.300 member

Reged: 17/02/06
Posts: 127
Loc: Brazil

Re: magnum primers for the 9.3 x 74R [Re: paradox_]
#316882 - 28/05/18 02:01 PM

Thanks to all!

Very good advice. And it seems all answers above were very consistent with other good sources I found.

In addition to 4350 I will be using CBC 126 (which is a Magtech powder) and it is perhaps a bit slower than 4350.

Will take the advice to lower the charge and see where I get convergence while looking for precision and pressure signals.

Thanks again!

--------------------
Ddouble

Post Extras:

Eck
.275 member

Reged: 10/09/06
Posts: 64
Loc: Burke, VA

Re: magnum primers for the 9.3 x 74R [Re: DDouble]
#316892 - 29/05/18 03:15 AM

63.5 grains of IMR 4350 with a 286 grain bullet and standard primer shot extremely well in my Chapuis (2 pair L&R into 3/4” at 50 yards) but were crossing.

I’m unconvinced that magnum primers are needed for this and the 375 H&H.

Edited by Eck (29/05/18 03:16 AM)

Post Extras:

DarylS
.700 member

Reged: 10/08/05
Posts: 26998
Loc: Beautiful British Columbia, Ca...

Re: magnum primers for the 9.3 x 74R [Re: Eck]
#316898 - 29/05/18 07:59 AM

If groups are round and as tight as you need - there is no

need for magnum primers with THAT powder and charge/bullet.

I would also add to that, that there is normal spread, shot to

shot on the velocities.

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

Post Extras:

Pages: 1

Extra information

0 registered and 510 anonymous users are browsing this forum.

Moderator: CptCurl

Print Topic

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Topic views: 3686

Jump to

NitroExpress.com

Home | Ezine | Forums | Links | Contact