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Joined: Jun 2005
Posts: 2,285 Likes: 10
Campfire Regular
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Campfire Regular
Joined: Jun 2005
Posts: 2,285 Likes: 10 |
Have you considered adding small pocket 308 Win. brass loaded with a ball powder to the test? I'd be curious as to those results well. I believe I have some shot strings stored in my silver mountain system of 7 1/2s vs 450s in .308 lapua sp brass with N150 and a 155.5 bullet. The 7 1/2s were slightly faster if I remember correctly. I'll be able to check in a couple of days. I checked the data I had stored in my e target and find that for 10 shot strings at 1000 yards the 7 1/2s averaged 1292 fps, SD 8.6 fps and the 450s 1290 fps, SD 12.2 fps. Statistically a tie and I would need longer strings to validate any SD comparisons. My go to loads use the 450s. I did lookup my notes on German Salazar's testing, and with a strain gauge equipped 6XC the 7 1/2s were about 1000psi hotter than CCI BR4s. He did not test the 450s.
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Joined: Jul 2001
Posts: 60,256 Likes: 38
Campfire Kahuna
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OP
Campfire Kahuna
Joined: Jul 2001
Posts: 60,256 Likes: 38 |
Thanks for the info.
Just checked some of my older testing in a .22 Hornet with Li'l Gun, and in that one 450s were hotter than BR4s--but for some reason I also didn't try any 7-1/2s..
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Nov 2007
Posts: 2,217
Campfire Regular
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Campfire Regular
Joined: Nov 2007
Posts: 2,217 |
Can't say if Star Line has done any actual comparisons, but this comes directly from the the 6 Creedmoor srp brass page:
"As with all types of cases this large with small primer pockets, it will require care in powder and primer selection in cooler temperatures to prevent hang fires. Single-based propellents are generally easier to ignite and a quality primer such as the Remington 7 1/2 BR are recommended."
I've been using 7 1/2 s with CFE223 with good results in the 6Cm, but haven't had a chance to try the load in cold weather.
Then you will know the truth and the truth will set you free. John 8:32
A lie doesn't become truth; wrong doesn't become right; evil doesn't become good, just because it's accepted by the majority...Rick Warren
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