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.375 H&H 300g bullets best velocity

 
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  #36  
Old 12-12-2013, 09:22 AM
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Re: .375 H&H 300g bullets best velocity

Lefty

Thought about that. Problem: only can I have is 30 years old. I haven't seen 4320 on the shelves in about four years. Delivers top velocity and accuracy in 150-30/06. If I can find new stock I will try some. Same speed range as 760/414, Biggame, and RL15.

KB
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  #37  
Old 12-16-2013, 11:56 AM
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Re: .375 H&H 300g bullets best velocity

H4350 and IMR 4350 are single base powders and very old technology. The Reloader 17 is a new formula and is significantly faster with similar pressure. The VithaVuori N-540 produced 2800 fps easily with 260 gr Accubonds on the bench next to me at the range yesterday (375 Ackley 26 inch barrel).

VV N-550 has the same burn rate as 4350 but significantly more zoom. If speed is your game, VV 500 series is the fastest you are going to get.
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  #38  
Old 12-16-2013, 12:36 PM
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Re: .375 H&H 300g bullets best velocity

65WSM

Ditto to what you posted except burning rate. H4350/ IMR 4350. RL17 and VV 540/550 have about the same burn rate. VV540/550 and RL 17 are both double based as compared to single based powder. Their rates are adjusted to approximate 4350 but their energy density is higher owing to the added nitroglycerin content. Like you I have found they have more energy to develop velocity than 4350. They burn hotter too so it has an effect on barrel life. Probably not enough to concern 375 H&H shooters.

Reloader is denser physically also. Ball powder even more so. In a 375 Ruger case filled to the shoulder/ neck junction (same case for all three):
Superformance (ball)= 95.6 grains
Reloader 19 (double based stick)= 89.6 grains
IMR 4831 (single based stick)= 84.6

You can use this to your advantage by utilizing the extra powder density to shift your burning rate choice to the slower end. By switching to ball powder you can really move slower. Superformance, BigGame, WW760 and AA2700 that I have used in the 375 Ruger so far are no where near 100% loaded density. I am looking at WW780 and slower ball types to fill the case and still reach top pressures.

That has worked for me to develop maximum velocity in the past. Doesn't guarantee accuracy though.

KB
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  #39  
Old 12-26-2013, 07:58 AM
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Re: .375 H&H 300g bullets best velocity

I stumbled across this .375 H&H load data. Food for thought:

Real Guns - Handload Data - .375 H&H Magnum
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  #40  
Old 12-27-2013, 09:32 PM
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Re: .375 H&H 300g bullets best velocity

Real Guns online magazine is one of my primary research places for loads. His work on the 375 Ruger was a deciding factor in buying one.
There are different bullets than the regular makers used, like the GSC's Len advertises on this site. He also uses a wide range of burning rate powders. He loaded RL19 behind the Sierra 300gr SpBT in 375 Ruger to good effect. Be advised that some of the loads can be pretty hot.
Always a good plan to collect as much data as one can before sitting down to the loading bench.

KB
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  #41  
Old 12-29-2013, 01:53 AM
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Re: .375 H&H 300g bullets best velocity

Here is some load data that I received from Cutting Edge bullets while discussing how to tune the MTH's:

375 H&H, 300 MTH and 325 LAZER, for single shot or single feed ONLY, 11-26-13.pdf

I thought this might be interesting given our discussions about appropriate powders and burn rates. Note that data is included for the soon to be released 325 grain Lazers.
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  #42  
Old 04-19-2014, 03:29 PM
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Join Date: Jul 2013
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Re: .375 H&H 300g bullets best velocity

Thank you for posting the info here. I am considering to pick up a 375 H&H or similar, and it is always helpful to have the path partly blazed before you jump in.

I had actually been looking at moderate recoil / 2000 FPS / using CEB 235 grain Raptor ER round for my use, but after looking at the BC of those MTH rounds - wow.

There are just so many decent performance rounds at reasonable prices for this caliber, it is hard to not consider it.
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