Doing some load development for my RPR 6.5CM and am getting substantially lower velocities than data anywhere. For example, using 140 grain ELDM bullets over 41.5 grains H4350, I’m averaging 2645fps. The gun is factory with roughly 500 rounds on it. 24” barrel. At 41.9 grains I’m averaging 2677fps. I’m using new but sized Starline brass, small magnum primers. Wondering if I should keep going up as I haven’t seen pressure signs. Thought?
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Low MV
- Thread starter Gd33333
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Hornady manual has 41.5gr of H4350 at 2700 and is their book max. So, you're not that much slower.
If you keep going, you're not going to get any amount of substantial performance increase from another 50fps or so.
If you keep going, you're not going to get any amount of substantial performance increase from another 50fps or so.
I'm getting 2678 with single-digit SD's, tight groups, and sub-MOA over 1,000 yards with 43.0g of StaBall. Let your rifle tell you what the right velocity is. Ignore what others "think" it should be.
True. I keep hearing 41.5 gr H4350 is the sweet spot for the 140 grn bullets. I’m not seeing fantastic SD’s here so has me scratching my head.
Getting higher velocities from factory ammo so just just making sure I’m not missing something. Thanks
That powder seems a bit slow, but some of that might because you're loading with a long COAL??? Another issue might be the humidity you're loading in where if it's somewhat high humidity, the powder might have higher moisture content slowing down the burn rate . . . ??? Just a couple of thoughts that came to my mind.
Note that you've filled the cases pretty full if you're loading to a COAL of 2.800. See chart below that you might find of some help.
Factory ammo often has special powder blends that develop higher MV. Higher MV doesn't necessarily correlate to more consistent ammo though, and it takes a ton of MV increase to buy better wind performance.
Small groups and small SDs are what you want, don't worry about the final MV average.
When I loaded 6.5 CM I was hitting pressure around 2750 fps. Shot best around 41.5 of H4350 with a 142 smk. I wanted more so I went back to 260 rem.
Depending what you want to do. You’ll be fine for 1,000 yd + with that speed
Depending what you want to do. You’ll be fine for 1,000 yd + with that speed
I bought some of that but haven’t tried it yet.
i like that chart. Where did you get it?
Shooting my first prs match this spring so trying to find my perfect pill. Thanks
That chart is from the app called QuickLoad. It's a helpful tool for developing a load. Is something that helps reloaders get in the ballpark and can save time and components as one develops a load. There's a somewhat steep learning curve to get to using it correctly.
It's not free.
You can look it up with a search.I’ll check it out. Thank youThat chart is from the app called QuickLoad. It's a helpful tool for developing a load. Is something that helps reloaders get in the ballpark and can save time and components as one develops a load. There's a somewhat steep learning curve to get to using it correctly.
It's not free.
There isn’t one. Buy a good bullet and develop its favorite powder and seating depth recipe. You can make just about any bullet these days shot well
Don't worry your bullet will be the least of your problems lol. Ammo will start to matter in year 2.
