YES.. you can use the mag primers BUT you need to reduce the load 2 or 3 grains and work up the load. you could experience higher pressures with the mag primers. Dave
Posts: 2134 | Location: Ohio | Registered: 26 June 2000
Deerdogs, no problem going to a magnum primer, but all charts I have seen place the standard Federal 210 above the CCI250 in "heat". In other words, the Federal standard primer is hotter than the CCI magnum. As usual, reduce and work back up when changing components. HTH, Dutch.
Posts: 4564 | Location: Idaho Falls, ID, USA | Registered: 21 September 2000
In loading 243's with 55 gr. Nosler BT and 49.0 gr H-380, I had extreme spreads of over 120 fps and Std. Dev. of 75+ using WLR primers. The avg. velocity of 10 rounds was 3709 fps.
I thought I would try WLRM primers to see if it would help the consistancy.
Again a 10 shot average: 3788 fps, extreme spread of 30 fps, std dev 8.
I have been using WLRM primers in my 6.5x55 for some time now. I felt it a good idea to rework the loads starting at 10% below my previous load. I have not seen any pressure signs with IMR4350 and IMR4831 right up to the previous loads. I will keep trying though!
------------------ Endeavor to Persevere
Posts: 281 | Location: MN | Registered: 27 May 2001
When to use "magnum" primers? When they are either (1) cheaper than standards (never, unless you find a closeout), or (2) perform better (infrequent, but it happens).
Posts: 13243 | Location: Henly, TX, USA | Registered: 04 April 2001
I follow John Barsness's suggestion in a Handloader article to use magnum primers with ball powders for cases that use a Large Rifle primer.
It probably isn't necessary, but any of the resulting loads that were unsatisfactory, were so far off the velocity I was trying to reach that a cooler primer certainly wouldn't have helped!
I even use CCI 250 magnum primers to light off 35.0 grains of W748 in my .30-30 and it goes 1.5-2 MOA with 170-gr. bullets from Nosler, Hornady or Sierra.
John
Posts: 1246 | Location: Northern Virginia, USA | Registered: 02 June 2001
