|
Joined: Jul 2009
Posts: 2,875
Campfire Regular
|
OP
Campfire Regular
Joined: Jul 2009
Posts: 2,875 |
Any standard rule of thumb on powder reductions when switching from standard (CCI200) primers to magnum (CCI250) primers? Most of my loading is for a 257 Roberts (IMR 4350 and H4831SC) and a 308 Win (Varget and RL15). Thanks
Retired and Loving It!! ΜΟΛΩΝ ΛΑΒΕ
|
|
|
|
Joined: Aug 2005
Posts: 3,712
Campfire Tracker
|
Campfire Tracker
Joined: Aug 2005
Posts: 3,712 |
I've used them interchangeably in various calibers without problems.
Jim
|
|
|
|
Joined: Oct 2007
Posts: 14,274
Campfire Outfitter
|
Campfire Outfitter
Joined: Oct 2007
Posts: 14,274 |
No need for Magnum primers in those calibers unless you use a ball powder.
Its all right to be white!! Stupidity left unattended will run rampant Don't argue with stupid people, They will drag you down to their level and then win by experience
|
|
|
|
Joined: Jul 2009
Posts: 2,875
Campfire Regular
|
OP
Campfire Regular
Joined: Jul 2009
Posts: 2,875 |
I have 800-900 mag primers, and less than 100 standard. Just wanted information in case I ran out of standards before I could find more.
Retired and Loving It!! ΜΟΛΩΝ ΛΑΒΕ
|
|
|
|
Joined: Mar 2006
Posts: 1,561
Campfire Regular
|
Campfire Regular
Joined: Mar 2006
Posts: 1,561 |
Any standard rule of thumb on powder reductions when switching from standard (CCI200) primers to magnum (CCI250) primers? Most of my loading is for a 257 Roberts (IMR 4350 and H4831SC) and a 308 Win (Varget and RL15). For those cartridges, you can use them interchangeably. There may or may not be a difference in accuracy; perhaps even for the better. Also, in cartridges of that size, there is no need for magnum primers even with ball powders.
|
|
|
|
Joined: Oct 2007
Posts: 14,274
Campfire Outfitter
|
Campfire Outfitter
Joined: Oct 2007
Posts: 14,274 |
Any standard rule of thumb on powder reductions when switching from standard (CCI200) primers to magnum (CCI250) primers? Most of my loading is for a 257 Roberts (IMR 4350 and H4831SC) and a 308 Win (Varget and RL15). For those cartridges, you can use them interchangeably. There may or may not be a difference in accuracy; perhaps even for the better. Also, in cartridges of that size, there is no need for magnum primers even with ball powders. Not what Winchester,Speer and Ramshot recommends
Its all right to be white!! Stupidity left unattended will run rampant Don't argue with stupid people, They will drag you down to their level and then win by experience
|
|
|
|
Joined: Jun 2004
Posts: 11,116 Likes: 1
Campfire Outfitter
|
Campfire Outfitter
Joined: Jun 2004
Posts: 11,116 Likes: 1 |
I've run about four instrumented tests on pressure and muzzle velocity using Federal and CCI standard and magnum primers in cartridges 30-06 and smaller. With proper control of chamber and cartridge temperature, I have never found a real MV or pressure difference between any of those four primers.
That is not to say there is no case where primer makes a difference. I'm sure that a very large primer is beneficial in the 50 BMG, for example.
All that said, I do think that many of the reported differences in those primers are artifacts from lack of control of temperature, failure to apply proper statistical tests, failure to randomize the experiment, etc.
Last edited by denton; 08/22/09.
Be not weary in well doing.
|
|
|
|
543 members (1beaver_shooter, 1234, 1lesfox, 17CalFan, 007FJ, 01Foreman400, 59 invisible),
2,370
guests, and
1,268
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
Forums81
Topics1,192,381
Posts18,488,572
Members73,970
|
Most Online11,491 Jul 7th, 2023
|
|
|
|