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Joined: Sep 2004
Posts: 17,436
Campfire Ranger
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OP
Campfire Ranger
Joined: Sep 2004
Posts: 17,436 |
I purchased this Tikka 22 Creedmoor from Landboy. Discovered in the process it was the 223 I'd sold him a while back, and he'd rechambered it. Took it out yesterday with Alpha brass, WLRP, Superperformance and Hornady 75 BTHPs jammed 0.01" into the lands. Scope is a 6x MQ. Never did find pressure, at least as measured by primer cratering. I'm liking the 41 grain load. Might ladder up to the book max of 43+ just to see. All at 100 yards, all three shot groups.
“Live free or die. Death is not the worst of evils.” - General John Stark.
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Joined: Mar 2006
Posts: 20,918 Likes: 1
Campfire Ranger
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Campfire Ranger
Joined: Mar 2006
Posts: 20,918 Likes: 1 |
Looks like 41 gr is the sweet spot. This gives me hope for my, yet to be delivered, 22 Creedmoor. I purchased 8 pounds of Superformance while testing my first custom rifle in 300 WSM. It did not work out. Based on your tests, it looks like I may have a use for it.
Keep us updated.
"I never thought I'd live to see the day that a U.S. president would raise an army to invade his own country." Robert E. Lee
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Joined: Jun 2001
Posts: 19,100 Likes: 3
Campfire Ranger
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Campfire Ranger
Joined: Jun 2001
Posts: 19,100 Likes: 3 |
It has been pretty much found that primer cratering does not define over pressure
If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles
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Joined: Sep 2004
Posts: 17,436
Campfire Ranger
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OP
Campfire Ranger
Joined: Sep 2004
Posts: 17,436 |
Hodgon's guide lists 40.0 - 43.5 for the 73 grain ELDM, and 38.3 to 41.7 for the 77 Sierra HPBT. It does not list the brass manufacturer, but Alpha's brass is hell for stout. I'm confident I'm not overpressure. What method do you use for determining pressure, absent pressure gauges? It has been pretty much found that primer cratering does not define over pressure
“Live free or die. Death is not the worst of evils.” - General John Stark.
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Joined: Aug 2015
Posts: 13,258 Likes: 3
Campfire Outfitter
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Campfire Outfitter
Joined: Aug 2015
Posts: 13,258 Likes: 3 |
Velocity is my primary indicator. Primers vary in cup thickness and hardness. A soft primer cup will crater before a harder one. Brass varies in alloy, hardness and volume. Unless you have pressure test equipment velocity is your best indicator.
Let's Go Brandon! FJB
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Joined: Dec 2002
Posts: 25,960 Likes: 9
Campfire Ranger
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Campfire Ranger
Joined: Dec 2002
Posts: 25,960 Likes: 9 |
Very well said.
Though cratered primers do tell me the load is getting too hot for this particular powder. Not that I have any idea what that pressure actually is.
Velocity is a much better indication of actual pressure.
People who choose to brew up their own storms bitch loudest about the rain.
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Joined: Jun 2001
Posts: 19,100 Likes: 3
Campfire Ranger
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Campfire Ranger
Joined: Jun 2001
Posts: 19,100 Likes: 3 |
Hodgon's guide lists 40.0 - 43.5 for the 73 grain ELDM, and 38.3 to 41.7 for the 77 Sierra HPBT. It does not list the brass manufacturer, but Alpha's brass is hell for stout. I'm confident I'm not overpressure. What method do you use for determining pressure, absent pressure gauges? It has been pretty much found that primer cratering does not define over pressure Chronograph for velocity
Last edited by saddlesore; 10/17/23.
If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles
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