300wsm or 300win mag for the 230gr hybirds
- Thread starter kev77
- Start date
Kev I use fed-215 But I've tried the Fed- 210 but they cut velocity by about 50 fps. With 67 GR. of 7828 SSC I was shooting the 230's at around 3020 or so. I started at 64 gr. and worked up. The 215 burgers you should be able to get 3100 fps. The other thing I was wondering about was how fast can either of these bullets be pushed before they come apart. Maybe someone in warmer climate that shoots all the time can help.
Joe Salt
Joe Salt
Alex Wheeler
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I have two 300 wsms with the same chamber Toms .212" fb. One is a 24" benchmark, the other is a 27" Kreiger, both 10 twist. The Benchmark will blow the Kreiger away for speed. I have seen 2840 with a 215 and h4350 out of the benchmark with no pressure. The Kreiger will run 2900 tops with h4831sc. The first powder I ran in that kriger was 7828ssc. It did not produce more velocity than h4831sc in my barrel, so I dropped it for 4831sc for the temp stability. I have a friend that runs the 7828ssc in a 284 and he has reported temp swings do effect it. Joe is right about the individual barrels, sounds like hes got a fast one.
Ledd Slinger
Silver $$ Contributor
Most all IMR powders I have tried in the past, including IMR 7828, are temp sensitive. Many of the slow Reliant powders are as well, RL-22 probably being the worst. Alliant RL-17 is probably the least sensitive to temp swings and works great in rifles that like fast powders as well as rifles that like slow powders with heavy bullets. RL-17 has a massive useable burn rate range across all spectrums of calibers and bullets.
If your rifle likes slow powders like IMR 7828, it will like RL-17 as well. RL-17 will give same velocities or better with less charge weight. I have compared IMR 7828ssc against RL-17 many times with many different calibers. If H-4350 works well and you don't feel like trying Rl-17, I would stick with H-4350 as it is known to be stable in varying temps
If your rifle likes slow powders like IMR 7828, it will like RL-17 as well. RL-17 will give same velocities or better with less charge weight. I have compared IMR 7828ssc against RL-17 many times with many different calibers. If H-4350 works well and you don't feel like trying Rl-17, I would stick with H-4350 as it is known to be stable in varying temps
I found the opposite , I use it in a .284 and a Shehane from -15c to 25c I use the same load in both . even warmer temps didn't seem to affect them. I could never get RL 17 to shoot as well as 7828 and 4350.Ledd Slinger said:
Alex Wheeler
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Joe, I dumped 7828ssc right away due to not getting the velocity increase I expected and 4831sc shot much better right off the bat so I have no personal experience with its temp sensitivity. I would not worry about it for Br, you will have a pretty good idea of what temp you'll shoot it. Mine is a hunting rifle and out here the temp can change 40 degrees or more in a day. I have tested H4350 and H4831sc by letting them soak in a hot chamber for 15 seconds. No change across the chrony. I know my rl15 I use in the dasher is very temp sensitive, you really have to stay on it.
Ledd Slinger
Silver $$ Contributor
6mmcldasher said:
Perhaps it was just my rifles because they never seemed to like 7828ssc in the first place. It did not ladder test as well as other powders for me. The difference in accuracy I have seen in large temp swings is not an overly significant amount, but definitely noticeable. That was when I developed loads at 30 degrees F and shot it again in 75-80 degrees F. So it was a huge difference in temperature that most powders would struggle with. RL-17 will change as well in a large temp swing like that, but it always seemed to be less in my experience. My IMR-7828ssc now just sits on the shelf collecting dust...
I have used RL-17 in many calibers with excellent results. Including, 6.5x47L, 6mm Rem, 6.5x300 WSM, 6.5 Rem Mag, 7mm Rem Mag, 300 Win Mag, and 338-375R. That's not saying it will work in the OP's rifle very well for sure, but it may be worth a try if he is not happy with H-4350 or 7828 after testing. Just another option.
Ledd Slinger
Silver $$ Contributor
Joe Salt said:
They can't keep the powders they already offer on the shelves as it is, so not sure why they are focusing any time on producing something new unless they intend to replace one of their current productions with it. I have seen some around at one of the local shops, but it was an 8 lb. keg. No way I'd spend that much money on a powder that may not work. If I see some 1 lb. cans around, I may give it a try just for fun.
Ledd Slinger
Silver $$ Contributor
dkhunt14 said:
Yeah we're pretty dry. I have a healthy supply of the powders I need, but it seems other folks are still buying whatever they can get their hands on around here. Hopefully the new IMR powders work out well. I picked up the new Hogdon reloading manual that has the new IMR powders listed, but haven't had the chance to read anything about them in the manual yet. So I don't know what their supposed advantage is over the other IMR offerings yet. Is the new IMR line supposed to be more temp stable or have a wider effective burn rate range?
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