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.375 H&H 300g bullets best velocity

 
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  #29  
Old 12-11-2013, 03:20 AM
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Join Date: Dec 2009
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Re: .375 H&H 300g bullets best velocity

I have some RL19, so I could do a quick velocity run up to see what it does the next time I am able to experiment. I really think I am getting to the point where Quickload would be very useful. I am planning to add that tool to my arsenal and see what it spits out. I am also contemplating a Magnetospeed chrono to make things easier.

I am glad to encounter another interested .375 shooter. There can't be enough of us to my way of thinking. I apologize in advance for the slow pace of my experiments. I only have a small window of opportunity to continue them every few months.

I will continue to post results as development continues. When I have something meaningful (like a finalized load), I will post photos.
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  #30  
Old 12-11-2013, 03:53 AM
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Join Date: Dec 2009
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Re: .375 H&H 300g bullets best velocity

One more link that may be of interest:

.375 Weatherby Dialed In

I really liked this guy's setup and he was getting some pretty impressive results.
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  #31  
Old 12-11-2013, 11:30 AM
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Join Date: Jul 2012
Location: Washington State
Posts: 286
Re: .375 H&H 300g bullets best velocity

I see in his post he is using H414, the same powder as WW760. I have a developing load of 260gr AB, 79.5gr WW760, Fed #215, that clocks 3000fps+ with a SD of 9fps. This powder holds potential. The above load is maximum pressure in 375 Ruger and is shot through a 26" barrel.

Read about the Magneto-Speed on another site. One caveat: hanging things on the barrel changes the accuracy. Optical chronographs allow group testing concurrent with velocity. The Magneto seems like it would be faster to set up and insensitive to environmental conditions, a real plus when things seem haywire. Pick and choose. I wonder if CFE causes problems w/ the Magneto-Speed as it supposedly may contain Tin?

Have you tried the Speer 270gr SpBT? I bought a box but have to figure out a load as Speer does not list any 375 Ruger data.

Keep going!!!

KB
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  #32  
Old 12-11-2013, 12:11 PM
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Re: .375 H&H 300g bullets best velocity

What kind of accuracy are you getting with the WW760? I was pretty impressed by the accuracy exhibited by the .375 WBY w/H414.

I normally test velocity and accuracy separately, so the Magnetospeed hanging on the barrel doesn't present a problem for me. Portability and versatility are the selling points for me. Don't know whether CFE would cause an issue or not. I was trying that with 250g TTSX's in my H&H, but never finished development. It would be interesting to see if an issue arises with that or not.

I haven't tried the Speer bullet. I have some Hornady 270g SP flat base bullets that I will probably never shoot. Alliant shows data with the Speer BTSP in H&H. It should get you in the ballpark for a starting load:

Alliant Powder - Reloader's Guide

Hodgdon shows .375 Ruger data for the above mentioned Hornady bullet. Again, not exact, but should get you in the ballpark:

Cartridge Loads - Hodgdon Reloading Data Center - data.hodgdon.com

Last edited by benchracer; 12-11-2013 at 12:15 PM. Reason: too many in's
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  #33  
Old 12-11-2013, 04:30 PM
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Join Date: Jul 2012
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Re: .375 H&H 300g bullets best velocity

Just starting with this rifle. Like you I do not test groups until I have the velocity I want. As this was the first 29rnds fired getting on target was @ 25yds. Most shots not even counted until the chronograph was dialed in. But that load was the last one fired and it was a 3/8" hole for 5 rnds. I should mention that I have chronographed since the 80's. Never found a load w/SD > 30fps thar made little holes. Every load <20fps drilled single holes @ 100yds. This one went SD=9fps so it gets 100yd check. Zero spread at 25yds.

My phone stores PDF files so I keep Ramshot, Accurate complete load manuals on it. Selected pages of VihtVouri, Hodgdon's and Alliant also. Helps when you look @ powder they have and can see if it works. I did that when I passed up AA 270 @ $20/lb not knowing it was ideal for 375 Ruger. You may want to look at it too. Never get caught without data again!!!

KB
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  #34  
Old 12-11-2013, 04:34 PM
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Join Date: Jul 2012
Location: Washington State
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Re: .375 H&H 300g bullets best velocity

My typing sucks! AA 2700. Ramshot Hunter is on the list when I can find some. Anything around 4350 speed and dense.

KB
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  #35  
Old 12-12-2013, 08:24 AM
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Join Date: May 2012
Location: N.D.
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Re: .375 H&H 300g bullets best velocity

try 4320 guys. Extruded but short grain and fine enough to measure well. I'm using the heck out of it in my 375h@h. Just a bit faster than 4350 but slower than 4064/4895.
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