Looking for some advice. I'm working up a load for a friends 300 WBY Mag. It's a custom Weaver Rifles with a 24" tube. Current load is 80 grains R22, Fed 215 primer, 178 ELDX, and hornady brass. With a COAL of 3.600. It groups well but the speeds are very high. I'm averaging 3340 FPS on chrono. I have confirmed speeds on other rifles with this chrono. Brass and primers look good and bolt is not stiff at all. I'm a bit worried about giving it back to him with this load. Any advice/input would be great.
300 WBY Mag
- Thread starter Strick27
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Bater
Well-Known Member
My 26" RUM only runs 3325fps with 180's so yeah I'd say you're a touch fast. If your confident in your chrono I'd drop the charge and look for an accuracy node between 3100-3200fps.
Wolf76
Well-Known Member
I'd ditch RL22. Too sensitive to temps and hard on throats.
Look at H1000
Look at H1000
Bater yes I think it's way fast and with the R22 temp sensitivity it worries me when it warms up. I would be happy with 3100-3200. What's odd is I'm at a lower charge than the max out of the hornady manual and with a longer COAL so I should be safe on pressure. But the speed says differently.
Wolf i have had the gun for 6months now and haven't been able to get my hands on H1000. That was my first choice but yeah.... i played a bit with h4831 but accuracy and speed were awful.
Wolf i have had the gun for 6months now and haven't been able to get my hands on H1000. That was my first choice but yeah.... i played a bit with h4831 but accuracy and speed were awful.
MagnumManiac
Well-Known Member
My 300Bee hit 3400fps with 180's in a 26" barrel that was confirmed with 3 different chrony's. Mine had a .500" freebore and digested more powder with safe pressures. I also ran these loads over a pressure trace, so the loads were quite safe.
Your loads might be just fine if there are no signs of excessive pressure.
Cheers.
Your loads might be just fine if there are no signs of excessive pressure.
Cheers.
Where are you and what have your range temps been shooting at? I use RL22 in a couple 300B loads. I worked them up in spring in 70s degree weather and only hunt with them in zero to 50s degree weather so I have never had an issue.
I would find out if the custom smith went with the "Weatherby Freebore". Going with "standard freebore" ( which is less than "Weatherby Freebore"), and then risking someone shooting Weatherby Factory Cartridges is a mistake a smith doesn't want to make. Weatherby reportedly uses longer freebore to lower pressures while using greater charges. Quick Load shows your charge ,(Reloader 22 - 80.0 grs), to fill 98.2% of the cartridge. That's enough to make my liver quiver.
As you wrote you are using a Hornady Manual, I would also give Hornady a call for input.
Cast the chamber.
As you wrote you are using a Hornady Manual, I would also give Hornady a call for input.
Cast the chamber.
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Thank you everyone for the input. I live in idaho and have been shooting in 50-70 degree weather. The last shooting session it was right at 70 degrees and that's when I averaged 3340. I called the smith that built the gun today and he said his guns tend to shoot fast and handle pressure better because of tight chambering. I told him what load I am using and he informed me that's the exact load he uses to test the rifles. I think I'm gona leave it be and hope it doesnt push over 3400 in 80-90 degree temperatures but really I doubt it will even be in use during those times.
enjoy the energy if that's the case. That is impressive.
