Did some chrony shooting last week and thought you might like the results of my .257 weatherby.
76 grains of ramshot magnum under the 100 grain tsx barnes. Lit with a federal 215 M. velocity was 3550 from my 26 inch remington tube.
Just about what I was hoping for. Also shot my tried and true Roberts load of 46 grains H-414 with the same bullet lit with a fed 210 M gave me 3133 from my 20 inch ruger.
And last ,my custom JC-Higgins 30,06 put a 165 grain hornady interbond out of its 22 inch tube, at 2815. Pushed by 60 grains of RL-19. And the FED 210-M
I am very pleased with these readings, but I might try to push a little harder with the 06 load.
I have seen published loads of 62 grains. I would be extatic to get another 85 FT or so with a 165 from a 22 inch 06.
Switch to a 168 grain TSX , and get somthing like 2900 FPS
and the killing power would make my 06 a better elk rifle then a plain jane 300 win load.
At least in my mind it would !
...tj3006

I used mule deers data on the 264 win, and am getting right at 3200fps with a 142 smk from my 26" 264 win using 69 grns of ramshot mag, also tried some magpro in the 264 and 270 I think it will get the speed I need from the 264 if I need it to, however in the 270 win magpro can really dole out the speeds, I was below max recommended working my way up, and I got to a point where the speeds where getting ridiculous, I had to stop halfway through the 10 rounds I had loaded with different increasing charges, because I was going to exceed 3300 fps with a 130!!! I am gonna go back and try my starting load as it was already at 3167, which is about where I wanna be

Remington 700 .25-06
60.5 grains of Magnum
117 grain SST
Federal 215GM primer in Remington brass
3085 fps through the 35P chrony

My 257 Roy loves Ramshot Magnum. I've fired 9 different 3-shot groups with charges ranging from 71-75grs and the average group size from all groups is 1.030" with a best of 0.273". 75grs gets 3568fps out of my 25.5" Rock Creek barrel.

Wait till you have a 40 degree temp change and watch what happens to your loads using Magnum.

I no longer use the powder.

Dangit, I thought R22 was supposed to be the temp sensitive powder...

And I thought that honor belonged to RL25.

You guys sure make it easy to keep on lovin H1000.

I worked up my 257Wby handloads with Magnum in Feb. Temps were 10F-15F. Velocity was 3665 with a SD of 12.

The wind was tough to read as it was swirling through the valley we were shooting in so I had a ton of horizontal dispersion but pictured you get an idea of my vertical dispersion (an indicator of consistant velocity) @ 1K, @ 70 degrees, using the chart I ran for the 3665fps I worked up to @ 10F-15F.



Same rifle @ 600yds, copper stains are 257Wby/100gn TSX



Same rifle @ 700yds.



Point being I can live with whatever temp discrepancies there may be as my ballistics table that was run for my chronographed velocities @ 10F degrees is basically "Nuts On" to 1K @ 70 degrees and that 60 degree swing will easily cover the bulk of the temp range my hunting is likely to experience.

Hey Buddy, nice shooting.

Thanks, the smith deserves most of the credit as the rifle shoots every load I've ever tried very well.

As far as powders and temp sentsitivity goes, I'm into research not rumor.

So you shoot at 10 degrees and run a table based on 70 degrees and all the sudden the powder is no longer temperature sensitive.

I think I am missing your logic.

I think your "research" should be shooting cases/reloads that are at 70 degrees and shooting cases/reloads that are 10 degrees and measure velocities/ES/horizontal dispersion difference between the two.

Just me though, sorry if I am way off base here.

I ran the table @ 10 degrees based on the data I acquired at 10 degrees. I shot the table @ 70 degrees, horizontal dispersion is pictured on the 1st page.

Those are some great groups at a K using a 25 caliber. Impressive.

Here are my 3 shot 100y groups shooting a 6.5x284 out of a 700 Ti using Magnum powder at 85 degrees. This same load went to crap and started shooting 5" groups when the temps went to the low 40's. My velocity also was off by 60 to 70 fps.

[img][IMG]http://img.photobucket.com/albums/v705/su35/IMG_0181.jpg[/img][/img]

Bob- did you play with this more or was this a one time thing? I didn't notice this with Magnum when I played with it but if the differences were subtle, I might not have picked up on it. I have limited experience with Magnum but TAC is FANTASTIC. I have had great luck with Hunter and Big game but have not used them enough to get render a valid opinion. In it's burning range, I have never found a better powder than TAC. Won a BR match with it in fact.

Dennis

Dennis, No this was not a one time thing as I was obviously dissed
that this load may not work for me. I checked it multiple times
hoping that it was me or the rifle or? Not to be.

Also, JB, if I recollect correctly has commented that out of the Ramshot herd, Magnum is the only one that is temp sensitive.
I thought I had found "thee load" I ended up switching to 7828 SC.

Good gracious I hate to see/hear this cause 77grn of RamShot out of my 257Roy 25" Rock is slinging TripleShox's 3560fps a lil bit under half inch, and the 7828SC at 72grns are doing almost the same but not as fast. I'm sure glad I shot both powders.............thanks for the info. Guys!!!!!

I hope someone can prove my test wrong. I want them to!

Is it a primer thing?

SU are you using regular primers and horse1 magnum primers?

Actually, the Ramshot people don't claim that any of their powders are temp-insensitive. However, a lot of this depends on definition of temp-insensitive. There is no powder on the market that will get the same velocities (and pressures) at zero and 100 degrees F.

All powder tend to gain velocity and pressure above 70, but many will get very close to the same velocity at zero and 70. I have found TAC and Big Game to be very stable in this temp range, and this is with actual range testing with everything (not just the ammo) at the same temp. In other words, I went out and shot on a zero degree morning.

So far I haven't seen any vast loss from 70 on down from Magnum, certainly not like that of some other powders that will lose 150 fps. I have used it most in the .257 Weatherby at temps from 70 down to maybe 35-40, and haven't seen any difference in group size or POI.

Often such changes are the result of one rifle's characteristics. For instance, in the same .270 I once got very different results with two loads using different powders at 70 and zero. Both loads lost over 100 fps, but only one changed POI noticeably--and that was almost three inches!

I have also seen different temp results with different cartridges when using the same powder, so I don't believe there are any hard and fast rules. Basically we should all run tests at various temperatures with any load, if we want to be really sure how it will work the way we want it to.

Funny you bring this up. I worked up a load with IMR 4350 and 145gr. GS's in my 7x57 while the weather was 70-80ish. I bought some Hunter to try but never had the time to load any.

Early Monday morning I went out and shot the rifle after the ammo sat in the garage all night and I believe the low was 20ish.

They averaged 120fps slower and the zero was about 2 1/2" low at 100yds.

Didn't really care until I shot it @300yds. Waaaay low.

Glad I checked. These MT natives say it gets cold here sometimes.

That's about average for IMR4350, in my experience, the reason I mostly use H4350 for hunting instead these days.

It does get a little cold around "Harvey" sometimes!

so what about h4831 how temp stable is it??

cumminscowboy,

FWIW I use H4831 in my 25-06 and I have not seen any difference in POI, velocity or group size due to weather.

MD,

Good to know about the H4350. Might just run that instead.

Thanks, Travis

H4831SC is just as good as H4350 for temp-stability, which is why I use a lot of it too.

Any of you see the article (some time this year, I think?) about supposed temp-insensitive powders? It was saying that the temp insensitivity appears to vary significantly with cartridge, and even then isn't all that insensitive. Part of what the testing indicated made little sense to me, but the rest did. Anyone?

I haven't "tested" the Magnum to see how sensitive it was, but I used it in 1000 yd BR and I kept my ammo in a cooler and fired as soon as I could after chambering it. During a summer match, the ambient temperature of the first string of fire can be a LOT cooler than the third or forth group depending on how many shooters you have to accommodate. I was able to keep my zero and shoot good scores this way. I didn't bother during the winter matches though.

One powder that worked the same for me come rain,sun or cold, was VarGet. I never fired it at zero obviously, it's kinda hard to come by that here in AZ, but I did shoot it in 115 and 25- the differences in velocity were within the SD of the load itself.