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Went to the range today and it'd warmed up to -4, thought I'd see you there Sam...?
Had a chance to run some loads over the clock that I'd clocked in Oct (same batch of everything). I had the rounds in the garage over night, not sure the temp in there but it was butt cold thats for sure it ws -8 @ sunrise.
Oct when it was mid 60's the loads went @ 2911 fps, today the loads went @ 2845 and 2855. Loss of about 60 fps or so and the temp was about 70 degrees different.
Not bad I'm thinking.
Dober
"True respect starts with the way you treat others, and it is earned over a lifetime of demonstrating kindness, honor and dignity"....Tony Dungy
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Campfire 'Bwana
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Campfire 'Bwana
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Was the rifle as cold as the ammo?
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Joined: Apr 2001
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Campfire Ranger
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Nope, it'd be in the house all night. I'll run it out there for the night and the next trip. I have the ammo in the truck for tomorrow's session.
Ya think that'll make much diff?
Thx
Dober
"True respect starts with the way you treat others, and it is earned over a lifetime of demonstrating kindness, honor and dignity"....Tony Dungy
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Campfire 'Bwana
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Campfire 'Bwana
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I believe Denton has shown a cold rifle to be a pretty big "thermodynamic thief" in some situations. I was sitting on a deer stand from before daylight this weekend. I'm pretty sure the rifle and ammo had reached ambient temp (24 degrees F) and being a handloading gacker the thought crossed my mind. 
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Campfire Ranger
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I'll test again tomorrow, thx
Dober
"True respect starts with the way you treat others, and it is earned over a lifetime of demonstrating kindness, honor and dignity"....Tony Dungy
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Campfire 'Bwana
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Campfire 'Bwana
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Thank you. I'm not in a position to readily make such tests, and I'm interested to see what happens.
m
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Campfire Ranger
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I'm gonna stick a temp gauge in the garage as well, just so we know for sure.
Dober
"True respect starts with the way you treat others, and it is earned over a lifetime of demonstrating kindness, honor and dignity"....Tony Dungy
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Campfire Outfitter
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Campfire Outfitter
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I'm gonna stick a temp gauge in the garage as well, just so we know for sure.
Dober Or in layman's terms- a "thermometer"?  I'm interested to see the difference that a cold rifle makes to the velocity. Keep up the good work, Dober!
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Campfire Regular
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Campfire Regular
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Coincidentally, I shot some R-17 handloads in about 4 above yesterday. Sadly, I have no comparison for this load/cartridge in warmer weather, but I will later on! 
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Campfire 'Bwana
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Campfire 'Bwana
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Supposed to hit near -30F tonight Dober... should make for an interesting range session!
“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery
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Campfire 'Bwana
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Campfire 'Bwana
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Good info Dober!
You lost about 60fps and I lost about 50fps(last week) so I bet your rifle cooled off pretty quick once you set it on the bench.
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Campfire 'Bwana
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Campfire 'Bwana
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I'd like to run my 180/H4350 300 WSM loads tomorrow am!
“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery
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Campfire 'Bwana
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Campfire 'Bwana
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Dober and I might head out there in the afternoon. Maybe you can sweet talk him into an earlier trip and head out there with us!
My schedule is...uh...fairly open when it's below zero. That whole freezing mud deal....(grin)
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Campfire Outfitter
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That's some good info Dober! Thanks for sharing.
BTW, if it is -30 tomorrow morning, I hope you will take some pics of the "group hug" around the warm barrels... grin.
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Campfire Regular
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Campfire Regular
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Any change in the POI to go with the velocity difference?
I must confess, I was born at a very early age. --Groucho Marx
Patriotism is supporting your country all the time and your government when they deserve it. --Mark Twain
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Campfire Ranger
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I'm thinking that it was last week or so when Sam did some temp tests with two or three diff powders. I'm pretty sure that H4350 was one of them and so was R17. Can't recall the third maybe H4831?
All lost the same 50-60 fps if I recall right.
Sam, can you help me out on this?
We'll be there about 3 tomorrow Mac if you wish to come on out.
Thx
Dober
Last edited by Mark R Dobrenski; 12/07/09.
"True respect starts with the way you treat others, and it is earned over a lifetime of demonstrating kindness, honor and dignity"....Tony Dungy
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Campfire Ranger
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"Group Hugs"...last time I heard that mentioned it was by Ingwe. Spose it has something to do with those 7X shooters...  Dober
"True respect starts with the way you treat others, and it is earned over a lifetime of demonstrating kindness, honor and dignity"....Tony Dungy
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Campfire Kahuna
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Campfire Kahuna
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I'd be very interested in the results.
I have found in making my own BRRRR! tests that the rifle temp does make a difference as well. Which is why I put 'em out with the ammo overnight before running any tests. They are inside soft cases, and left inside them until they get shot. This keeps them from frosting up inside a warm vehicle.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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Campfire Ranger
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Thx John, I'm all over it.
If you're up to a road trip come on over to Logan for a 3 pm hard core shoot.
Don't tell Huntr and Ingwe though or they'll wanna do those darn "group hugz"...grin
Dober
"True respect starts with the way you treat others, and it is earned over a lifetime of demonstrating kindness, honor and dignity"....Tony Dungy
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Campfire 'Bwana
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Campfire 'Bwana
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Yeah Dober, I shot H4831sc, H4350 and R17. All 3 lost about 50fps and POI was just an inch or two lower at 400 yards.
I'll bring a couple old tires for us to light up. The hugs will be up to JB and Ingwe though!
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