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Greetings,

I'm wondering whether anyone has information to share on the suitability of Big Game powder for 270 grain TSX bullets in the .375 H&H.

Much appreciated in advance!

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Look at this chart.

http://home.hiwaay.net/~stargate/powder/powder.htm

Faster burning than W760 which is what Winchester loads behind 300 gr bullets.

I have had poor results w/Big Game in the 270 & 30-06.

All I use are Barnes in every hunting round and have found that the Data in Barnes website to be dead on. Their first choice goes to VIT N540, 2nd is RL15.

http://www.barnesbullets.com/inform...PSESSID=dabf304dab1d8af1f7162a865bc605b9

Last edited by goodiewrench; 05/31/11. Reason: correct error
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Thank you!

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75 gr Rl 15, 270 TSX, light crimp= magic!

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Not a gunwriter, but contrary to the above, it works really well with the 270 TSX in the .375. I have gotten good accuracy and velocity. Also, have had it do really well in the .30-06 with bullets of 165 and less.

Also, the link that Goodie posted, shows it FASTER (Not Slower) than 760 and closer in burning rate to RL15.

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Big Game is a very good powder in the.375, particularly with 270-grain bullets. However, the Ramshot rifle powders don't tend to operate all that well until the load get up approaches 60,000 psi. Many "traditional" handloaders give up when starting loads don't group all that well, but if you keep adding powder the groups usually tighten up considerably.

Big Game is a great powder in many cases that have moderate capacity for their bore-size. It's a great powder, for instance, in the .30-06 with 150-grain bullets, easily capable of 3000+ fps with tiny groups. Also great in the .22-250, .220 Swift and .243 with lighter bullets. But usually you have to load it up to near the max powder charge listed to get the good results.


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The 375 H&H was not designed to be a 60K pressure cartridge, All the classic India/Africa big bores were designed to operate at low pressure to ensure extraction under adverse conditions.
I'd go with the Barnes suggestions, especially given all the PHs suggesting the 270/300 TSX as THE Cape Buffalo bullet.

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I would imagine those loads in the Barnes manual shooting 270s at 2800 plus are every bit of 60,000 psi and maybe then some. Also, I've never had a problem with extraction using modern powders and modern pressures in a .375 and have shot them in heat up to 110F. I think discontinuing the use of Cordite a few years ago helped with that some.

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The maximum load with IMR4895 listed for the 270 TSX in the Barnes #4 manual is 73.5 grains.

Hodgdon lists a maximum load of 66.0 grains with the SAME bullet and powder, at 49,500 CUP--which converts to almost exactly 60,000 psi. So the maximum Barnes load is well over 60,000.

Unlike many of the larger British cartridges of the era, from the beginning the .375 H&H was loaded to 55,000 to 60,000 psi, about the same pressure as the .30-06. (The only exceptions were "tropical" Cordite loadings, and the flanged version for double rifles.) The SAAMI maximum average pressure for the .375 H&H is 62,000 psi, despite all the older rifles chambered for the belted round.


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I've been looking for a long range elk load for my 375. My rifle despises Accubonds. Rifle loves 72 grains of R15 with the 270 grain TSX. But its only going 2600 fps. Am trying the new TTSX but not successful so far. Dug a TTSX out of the berm at 425 yards and it was the picture perfect mushroom at 2800 fps and change from the muzzle but it wasn't accurate. With the listed load the TSX has almost varmit level accuracy, but dug those out of the berm also, and just the very tip is opened. Spoke with Barnes and the TTSX in the .375 is so new they don't have any loading data for it. Anybody have any suggestions? Sorry for the hijack OP.

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Lee why not try the new 250 TTSX?

Work up with RL15 til you hit 2850 or so and see how that shoots.I've been shooting 250 gr bullets in the 375 for quite awhile with good accuracy,to 400 yards or so.I use BBC's but I think the TTSX will work really well at that velocity.




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Sir, I'm sorry I wasn't clear. I am using the new 250 grainer TTSX with both Varget and R15 and I'm getting the velocity I want but not the accuracy. If I could get the new 250 grain TTSX to shoot, it would be my bullet of choice vice the 270 grain TSX.

I'm getting great accuracy with the R15 and the 270 TSX, but if I push it past 2600 fps the accuracy goes downhill fast. Outfitter asks that I arrive with rifle sighted in at 300 yards. I'm worried that if I get the 400 yard shot with a 2600 fps TSX I won't get expansion, so I'd like some speed and a lighter bullet. As it stands right now I can't get either the 260 grain Accubond or the 250 TTSX to shoot in my rifle.

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Lee,

Have you played with seating depth at all?


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Ramshot Big Game (made in Belgium in the SNPE powder plant of Clermont)is very close to the french-belgian powder SP7/PCL511. Same powders different lots and batches.
It worked well for me with older BarnesX 270grs with a max load of 71,5grs, CCI250 and Winchester cases. Got 2780fps with good hunting accuracy. Think Big Game must do with TSX, but as with all the sperical powders, it works better when close to the maximal loading density and near max pressure.
Dom



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Originally Posted by Mule Deer
Big Game is a very good powder in the.375, particularly with 270-grain bullets. However, the Ramshot rifle powders don't tend to operate all that well until the load get up approaches 60,000 psi. Many "traditional" handloaders give up when starting loads don't group all that well, but if you keep adding powder the groups usually tighten up considerably.

snip


I've noticed this with TAC, and was about to give up on Big Game and the .260 Remington, but will keep working up with it.


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For what its worth, QL reports >83,000 psi from 77 grains of RL15 behind the 270 grain TSX at a COAL of 3.590.

This seems a remarkable figure, if true.

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I don't trust any of the pressure numbers produced by QL combination very much. Have compared them to actual pressure-barrel results too many times!

Have found QL reasonabkly fun to play with IF you plug in a reasonable velocity. Pressure will then often also be reasonable, but the powder charge can be all over the place.


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les .257 sont presque aussi bons que le sexe

I don't disagree.


There is no accounting for taste.

Experience is a great thing as long as one survives it.

Generally, there ain't a lot that separates the two however,
Barely making it is a whole lot more satisfying than barely not making it.
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Originally Posted by Lee_Woiteshek
Rifle loves 72 grains of R15 with the 270 grain TSX. But its only going 2600 fps.


HOw far you shooting?

I get hits out to 1,000 yards with a 308 shooting 175s at 2550.

The Barnes ought to expand past 400 yards.

BMT


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Glad to know your experience is much the same, even in French!


“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck
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