Results on 300 win mag.

[dakor]

From what I have found you need to test your load at the range you are going to shoot. I would skip the 100 yard target and work your loads up from the 200 yard mark. Your rifle may not like BoatTail bullets either but before you come to that conclusion I would try R-22 and a Fed 215 primer. 100 yards is to close most bullets are still sleeping at that range. 200 yards or 300 yards gives the bullet enough time to come alive. My 7mm STW will shoot 160 Accubonds in the .2's at 100 yards. I took that same load out to 500 yards and it was a 6 inch group. /ubbthreads/images/graemlins/tongue.gif I then took that same load and at 300 yards it was a little over a 3 inch group. I know it was not my shooting because I was also shooting the 175 Sierra SPBT and it shot about a 1 inch group at 300 and a 2 inch group at 500 yards. The kicker is the Sierra at 100 yards shoots in the .6's to .7's but it shot better at longer range then the Accubond. I would also lose the Rem bullets. From what I have found they shoot well at 100 yards or closer but at longer ranges their accuracy goes down the crapper. Also with a big case like the 300 win you are going to want your load density's above 80% I do not believe that IMR-4350 will give you that. Slower Powders will give better velocity and better Accuracy. I would also try either the 180 Hornady Interlock or the Sierra 180. You may even want to pick up a box of 200gr Accubonds. Just keep at it you will get the rifle to shoot.

 

[Fotis]

In my opinion 300 WM=RL22

 

[gonehuntingagain]

Is RL-22 temperature sensitive?

 

[shilen30]

Yes, RL22 is temp sensitive. Look on Hodgdon's web site under extreme powders and it has graphs of temp vs. velocity. Hodgdon extremes vary approx 10 FPS over a 100 degree temp spread whereas RL22 and IMR powders varied as much as 100 fps.

 

[brian b]

[ QUOTE ]
Yes, RL22 is temp sensitive. Look on Hodgdon's web site under extreme powders and it has graphs of temp vs. velocity. Hodgdon extremes vary approx 10 FPS over a 100 degree temp spread whereas RL22 and IMR powders varied as much as 100 fps.

[/ QUOTE ]
Shilen30,
you have obviously been influenced by Hodgdon propaganda telling you that there EXTREME powders are not temp sensitive ,this is bull feces. it is just that some powders are more temp sensitive than others. RL22 is not really very temp sensitive but it's drawback is that it does vary from lot to lot ,find a lot you like and buy a lot of it.
B

 

[shilen30]

Yes, there may be some propoganda, but please give me your scientific data that proves otherwise, or anyone elses for that matter. If there is published data, such as the data put out by hodgdon (do you really think they would make it up considering the law suits that would so easily stair them in the face?) I want to know about it in all honesty. Believe me, I have stronger ties to alliant (ATK) and the people that develop their powder than most in this forum. Hey, RL22 is great stuff. I swear by it with the 180 grain bullets. I have personally seen differences in bullet drop from changes in temperature though. Does this make me want to stop using it? No, because it gives me the best groups. It also gives outstanding velocity in many calibers. A great product (though I would sure like it more consistant from lot to lot). I am not trying to down the product. Like I said, I more than anyone would want data to show that Hodgdon is wrong, and maybe there is some out there graphing velocity versus temperature that shows RL22 is less temp sensitive than Hodgdon claims. If there is hard evidence, I will be the first to promote it.

 

[TOM H]

[ QUOTE ]
Yes, RL22 is temp sensitive. Look on Hodgdon's web site under extreme powders and it has graphs of temp vs. velocity. Hodgdon extremes vary approx 10 FPS over a 100 degree temp spread whereas RL22 and IMR powders varied as much as 100 fps.

[/ QUOTE ]
I don't want to pick a fight with anyone but last summer I was trying some loads using H-4350ext,R-19 and R-22 for a custom 300wsm then I saw the post about those powders being temp senstive and about different lots etc. For me I just didn't see it. I shot alot of loads over the chronograph more than I would normally do. Just wanted to see how good that Broughton 5c barrel was. I tried 3rds of R-22 in the 300mag friday and does show some promise. I use R-22 in a 6mmremAI as a LR pd/coyote rifle and a 25-06. I get the R-22 in 1lb cans not all the same lot #. I load at the range so my powder temp is the same as a loaded round. I shot the 300wsm last fall over the chronograph maybe I'm just lucky and I didn't see a spike in velocity. I have found that the slowest shot is normally the first one over the chronograph so I rely more on that shot than the others. I not only record the average but keep that first velocity and compare that to the next time I chrongraph that load. On H-4350ext the difference on first shot test 3 different days was over 60fps on R-22 is was over 30fps and on R-19 was over 10fps and the difference on the following shots was less than 5fps. So that the load I use in the 300wsm plus it groups pretty nice. I get my groups first then will do the chronographing later at the 50yd range which has a real nice concrete pads and benches are level to those pads. Well good luck.

 

[shilen30]

See, that is the kind of information that should be posted. Do you have any info on actual temperatures versus velocity for the different powders? What i would like to see is the same type of info that is on the Hodgdon web site showing velocity for temperatures ranging from 100 F to at least 20 F. If you start talking about variation for constant temperature that is an entirely different ball game, and you are talking SD and SE for nearly constant temp, which depends more on your particlular rifle and the laod it likes, though there is some truth in stating that some powders on average have lower SE for the accuracy load. I by no means argue. I am a metallurgical engineer who must dispute theories for a living.

 

[GREYGHOSTt]

Alright how's about a update! TERRY...........

 

[abinok]

temp/velocity variation

Just a couple musings on temp enduced velocity variations...
After I get a load that is doing well at whatever the ambient air temp is, I test for accuracy while shooting over a chrony at 5 different temps
1. 4 degrees, the temp of my refrigerators freezer
2. 40 degrees, the temp of my refrigerator's top shelf.
3. Ambient air temp... whatever that is, preferably 72 /ubbthreads/images/graemlins/grin.gif.
4. Whatever temp the ammo reaches when I keep it in contact with my body under clothing for an extended period of time, about 80-85 degrees.
5. 127 degrees, the temp of my hot tap water, seperated from the ammo by a ziploc bag
You can keep the temp stable at any of those temps for several minutes, by using the ziploc in water technique,Just dont mess around on the way to the chrony, and remember to remove the rounds one at a time so they don't get a chance to warm/cool different than their bretheren. I usually do 5-8 rds per temp, about 25-30 total.
When I put this test data along side the info I have from developing the load, ive got a pretty good idea of what to expect under any circumstance.
Just my .02

 

[shilen30]

Re: temp/velocity variation

Have you been able to obtain enough data to draw any conclusions on different powders? Sounds like a pretty good test you ran.

 

[abinok]

Re: temp/velocity variation

eh... some might argue over whether my test sample is large enough to make difinitive conclusions, but ive got some data. So far all ive tested is h414, h4831, h4831sc, and h1000, all in 300WM. Ive tested the three slowest powders with either 200SMKs or 220SMKs, with the H1000 being the most stable, followed by the H4831sc, then h4831. H1000 was consistant to within 10fps across the board, probably within my margin of error. The twin 4831s gained 25fps, and 33fps respectively. The H414 was tested under 110gr Vmax. It showed a 60 fps gain from bottom to top. Im not saying its a bullet proof testing system, but its easy, cheap, and anybody can do it. You can get a lot more data from a quick and dirty test than all the pondering in the world.

 

[shilen30]

Re: temp/velocity variation

[ QUOTE ]
You can get a lot more data from a quick and dirty test than all the pondering in the world.

[/ QUOTE ]

Well said. I should heed that statement more often myself.

 

[samson]

I went through the same thing you are going through. I had a factory 300 wm and through hours of range time RL22 came out on top. As a matter of fact the others didnt compare. I used norma brass w/75 gr of 22 and 180 SST. I am having a custom rifle built in a 300 wm and will start with RL22. We will see what happens. Good Luck /ubbthreads/images/graemlins/wink.gif