Deleted
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Post by Deleted on Dec 3, 2012 18:50:12 GMT -8
I use CCI 450 exclusively in all my loading. I have not found any inconsistencies with any of the powders I have used.
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Post by GLSHOOTER on Dec 3, 2012 19:21:18 GMT -8
I noticed that the CCI 400 primers showed more deviation in velocity and premature signs of high pressure (flattened primers) in some of our 6.5mm PCC rounds from the BHW barrels... I had known that certain primer cups had variations in wall thickness, and thus was giving us signs of pressure. When we switched to the CCI 450 primers the velocities became more stable and the primer flattening stopped. The small rifle magnum primers seem to work well with the ball powders in the slower burn rate ranges...at least with the 6.5mm PCC case, based on our testing anyway. The faster burning extruded powders generally were more sensitive to the magnum primers and were less stable in velocity/pressure as you approached maximum loads... This will likely hold true for the Grendel/LBC case/round. I would say that trying to get top echelon pressures out of a little case like a 223 derivative is going to lend itself to very real pressure excursions when you light it off with a magnum primer. I've loaded the 6 PPC and the Grendels HOT with all kinds of powder and all I've all I've seen, given temperatures under 110, was a flattening of the velocity curve. No major up and downs in my experience. My primers have been exclusively Remington 7 1/2's as with the capacity of a Grendel case there is no need for the magnum spark as I don't intend to be shooting in sub-freezing weather. Greg
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Post by flutedbull204 on Dec 4, 2012 9:51:36 GMT -8
Save the flatter than normal primers in the cci400, I get very consistent velocity with my benchmark powder!
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dr69er
Senior Member
Protect the US Consitution & the American Way.
Posts: 222
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Post by dr69er on Dec 4, 2012 13:59:07 GMT -8
I noticed that the CCI 400 primers showed more deviation in velocity and premature signs of high pressure (flattened primers) in some of our 6.5mm PCC rounds from the BHW barrels... I had known that certain primer cups had variations in wall thickness, and thus was giving us signs of pressure. When we switched to the CCI 450 primers the velocities became more stable and the primer flattening stopped. The small rifle magnum primers seem to work well with the ball powders in the slower burn rate ranges...at least with the 6.5mm PCC case, based on our testing anyway. The faster burning extruded powders generally were more sensitive to the magnum primers and were less stable in velocity/pressure as you approached maximum loads... This will likely hold true for the Grendel/LBC case/round. I would say that trying to get top echelon pressures out of a little case like a 223 derivative is going to lend itself to very real pressure excursions when you light it off with a magnum primer. I've loaded the 6 PPC and the Grendels HOT with all kinds of powder and all I've all I've seen, given temperatures under 110, was a flattening of the velocity curve. No major up and downs in my experience. My primers have been exclusively Remington 7 1/2's as with the capacity of a Grendel case there is no need for the magnum spark as I don't intend to be shooting in sub-freezing weather. Greg The Remington 7 1/2 primers do have thicker cup walls vs. the CCI 400 primers...We have not had any problems with the Remington 7.5's during testing with any of our loads both light and max loads.
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Post by GLSHOOTER on Dec 4, 2012 15:33:11 GMT -8
I would say that trying to get top echelon pressures out of a little case like a 223 derivative is going to lend itself to very real pressure excursions when you light it off with a magnum primer. I've loaded the 6 PPC and the Grendels HOT with all kinds of powder and all I've all I've seen, given temperatures under 110, was a flattening of the velocity curve. No major up and downs in my experience. My primers have been exclusively Remington 7 1/2's as with the capacity of a Grendel case there is no need for the magnum spark as I don't intend to be shooting in sub-freezing weather. Greg The Remington 7 1/2 primers do have thicker cup walls vs. the CCI 400 primers...We have not had any problems with the Remington 7.5's during testing with any of our loads both light and max loads. Nor would I expect you to. Why do you think many of the guys shooting high intensity rounds using SR's use them quite a bit? You rediscovered what many of us learned about 20 years ago. Greg
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Post by acelungger on Dec 5, 2012 10:44:20 GMT -8
Hi All, A very good post! I would like to know the yardage that those target were shot at? I have put together 2 Grendel AR's and both of them are pure Tac Drivers I had been out of the gun loop for at least 15 years when a friend brung me some Gun Mag's,I allways said if they made a AR 15 in a 243 I would have to build one! As I was reading these mags I ran acrossed a article about a AR 243WSSM and I thought what in the H$$$ is a wssm?? So I goggled it, and made up my mind to put one together. I found that it was cheaper to buy a upper verses putting a upper togehter! I wished I would of ran acrossed a Article on the 6.5 Grendel first. Sorry about that. I feel that you have got a lot of info from those that have posted! If you can buy some Magtech primers I am sure that you won't have any flatting problems! I own several striker fire pistols that the primers are to hard and won't fire! ( the pic is of my 243wssm and my Target 223, I couldn't find my pic's of my Grendel Later Greg Attachments:
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Post by GLSHOOTER on Dec 5, 2012 10:51:35 GMT -8
Pretty much everything you see here is shot at 100 yards unless stated otherwise. The odd 50 yard is usually a dot style optic post and the 200 yarders have always been noted as such. Bragging rights on a 200 yarder aren't near as common as the 10's since it is also a shooter challenge working with the quality of the load.
Greg
PS: I have a 25 WSSM. Limited usage but nice if you need a 25-06 hammer at the time.
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Post by acelungger on Dec 5, 2012 11:10:07 GMT -8
Thanks Greg, Right now 100yds. is the limit where I shoot,a friend of mine is putting in a 800yd range, Lets say a place to go and shoot 800yds. It will be nice put not like a club range or pay range, he is a farmer and has property to due this, he won't be out much money. And the great thing is he told me i can go shoot any all the time. Later Greg
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Post by GLSHOOTER on Dec 5, 2012 12:53:09 GMT -8
Thanks Greg, Right now 100yds. is the limit where I shoot,a friend of mine is putting in a 800yd range, Lets say a place to go and shoot 800yds. It will be nice put not like a club range or pay range, he is a farmer and has property to due this, he won't be out much money. And the great thing is he told me i can go shoot any all the time. Later Greg 800 is a good challenge. My favorite for play has been 700 ever since I started teaching classes years ago. Not overly hard and doable for new students. Wind is always educational but on a semi-calm day an 8" plate is in serious danger!! Greg
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