|
Joined: Nov 2011
Posts: 3,184
Campfire Tracker
|
OP
Campfire Tracker
Joined: Nov 2011
Posts: 3,184 |
Sorry to be the bearer of bad news. The other day when I first shot for speed over the magnetospeed I said it was 33 degrees. In reality the Ammo and gun went into a warm car out of a warm house. So I'm guessing that I was getting 3200 at around 65 degrees. Today with the same load of 73grs. with the gun and ammo at a blistering -7 degrees below zero, I lost 100fps and the groups went to crap. My Retumbo and 168gr. CC still bug holed so twasn't me or the gun.
Back to the drawing board.
Want To Buy; Form die for a 7mm Mashburn Super. .284 Hornady AMax 162gr. .224 Hornady AMax 75gr. 22-250 bushing die Bushing die that will work with the 7mm Mashburn Super A couple Glock 42 380ACP mags
|
|
|
|
Joined: Jan 2007
Posts: 35,900
Campfire 'Bwana
|
Campfire 'Bwana
Joined: Jan 2007
Posts: 35,900 |
Did you shoot the H1000 load to see how it held up?
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
|
|
|
|
Joined: Nov 2011
Posts: 3,184
Campfire Tracker
|
OP
Campfire Tracker
Joined: Nov 2011
Posts: 3,184 |
The Retumbo and 168gr. Custom Comp lost around 50fps but kept its accuracy. I can live with that. When I got home today I loaded up some 75grs. H1000 under a 160gr. Partition and 75.5grs. of Retumbo under the 160gr. PT. I have some and the rifle chilling in the truck tonight the others I'll keep in my shirt pocket nice and warm. That should give me around 80 degree difference. I have a lot more Retumbo than H1000 so I'm hoping the results lean that way.
Want To Buy; Form die for a 7mm Mashburn Super. .284 Hornady AMax 162gr. .224 Hornady AMax 75gr. 22-250 bushing die Bushing die that will work with the 7mm Mashburn Super A couple Glock 42 380ACP mags
|
|
|
|
Joined: Apr 2011
Posts: 15,357 Likes: 10
Campfire Ranger
|
Campfire Ranger
Joined: Apr 2011
Posts: 15,357 Likes: 10 |
Great info Les. I've got a bunch of H1000 and Retumbo so I'm hoping once the new rifle shows up it works like the old rifle did.
I do like the Mashburn though. 2 seasons and 3 elk have made me a believer.
Semper Fi
|
|
|
|
Joined: Mar 2005
Posts: 26,317 Likes: 9
Campfire Ranger
|
Campfire Ranger
Joined: Mar 2005
Posts: 26,317 Likes: 9 |
Sorry to be the bearer of bad news. The other day when I first shot for speed over the magnetospeed I said it was 33 degrees. In reality the Ammo and gun went into a warm car out of a warm house. So I'm guessing that I was getting 3200 at around 65 degrees. Today with the same load of 73grs. with the gun and ammo at a blistering -7 degrees below zero, I lost 100fps and the groups went to crap. My Retumbo and 168gr. CC still bug holed so twasn't me or the gun.
Back to the drawing board. My chronograph strings are suggesting the opposite with IMR7977 with 270 and 243. I have not had the opportunity to chrono in really warm weather vs cold weather. But with temps at about 60 degrees vs high 20's there is no difference with identical loads and componets other than well within normal variation. I haven't mentioned my results because I wanted to wait until I had info that included temps from hot weather (like 80's or 90's ) vs cold weather (single digits). Knowing what the temps of the firearms, ammo and air is important. Cold/heat soaking the firearms and ammo, and operating the chrono in a warmish enviroment is important too. What brand of chrono were you using? Did you keep it warm during cold weather? Was the firearm and ammo heat/cold soaked? Casey
Casey
Not being married to any particular political party sure makes it a lot easier to look at the world more objectively... Having said that, MAGA.
|
|
|
|
Joined: Mar 2006
Posts: 20,940 Likes: 3
Campfire Ranger
|
Campfire Ranger
Joined: Mar 2006
Posts: 20,940 Likes: 3 |
My guestimate, based on what I've read, would be Extreme, then Enduron, then RL series. Just don't know the spread.
DF "Guesstimate"?! Wait a minute, I thought reloading was an exact science?
By the way, in case you missed it, Jeremiah was a bullfrog.
|
|
|
|
Joined: Mar 2006
Posts: 20,940 Likes: 3
Campfire Ranger
|
Campfire Ranger
Joined: Mar 2006
Posts: 20,940 Likes: 3 |
Today, at a blistering -7 degrees below zero, I lost 100fps and the groups went to crap.
Back to the drawing board. I seem to spend more time there than at the range. At least the drawing board is temperature stable.
By the way, in case you missed it, Jeremiah was a bullfrog.
|
|
|
|
Joined: Nov 2011
Posts: 3,184
Campfire Tracker
|
OP
Campfire Tracker
Joined: Nov 2011
Posts: 3,184 |
Casey; The crono is a magnetospeed and the Ammo and rifle were the same temp hot and cold.
Want To Buy; Form die for a 7mm Mashburn Super. .284 Hornady AMax 162gr. .224 Hornady AMax 75gr. 22-250 bushing die Bushing die that will work with the 7mm Mashburn Super A couple Glock 42 380ACP mags
|
|
|
|
528 members (10Glocks, 160user, 01Foreman400, 06hunter59, 1936M71, 10gaugemag, 71 invisible),
2,448
guests, and
1,145
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
Forums81
Topics1,193,699
Posts18,513,732
Members74,010
|
Most Online11,491 Jul 7th, 2023
|
|
|
|