375 H&H Load Data Now with RL17

Russ

Russ

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I was messing around with my new to me T/C Pro hunter in 375 H&H....The long standing KING :d
One of the things I like about the pro hunter is it's 28" barrel but the overall length is still only 42".
That is 2" shorter than a M98 action with a 24" tube.
The load was:
Hornady Brass
270gr Jacketed round nose bullet.
78.5grs H414
All touched off by a winchester large rifle mag. primer.

chronograph speed 10 ft from muzzle
2845fps

200yd Zero

100yd +1.8" 150yd +1.7" 200yd +0.0" 250yd. -3.5" 300yd. -9.2" 350yd -17.5" 400yd. 28.9"

Energy is still @ 1520fp and a speed of 1592fps at 400yds.

Not to shabby for a non-aerodynamic round nose bullet.

Russ...
 
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375 H&H Load Data

I ran a load through Quick Load with a sleeker bullet. A Speer 270gr.BTSP You can see how it pays off at the longer ranges.

2845fps

200yd. zero

100yd +1.5" 150yd +1.4" 200yd +0.0" 250yd. -2.8" 300yd. -7.1" 350yd -13.2" 400yd. 21.0"

Energy 2715fp and 2128fps at 400yds. Quite a gain for the same weight bullet at the same start speed.
 
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Just loaded up and run a couple 375's
Load:
Hornady brass
270gr.RN bullet
82.0grs of RL17
WLRM primer

2895fps 10ft from the business end.

Not a big increase over the H414 load. I'm sure I could squeeze a little more out of the RL17 load but at almost 2900fps for a 270gr. bullet what more do I need:)
 
I do not reload, but to maybe justify getting equipment to do it what are the appx cost savings in reloading .375 H&H? I do also shoot other cartridges, if reloading there would be no more factory ammo purchased...
 
Absolutely no savings lol. You'll end up shooting more. Realistically your savings will come from not paying for the brass. You will save some in loading premium bullets. Or substituting non premium bullets for target practice. If you want to shoot cast there will be a big savings there.
 
Russ said:
I was messing around with my new to me T/C Pro hunter in 375 H&H....The long standing KING :d
One of the things I like about the pro hunter is it's 28" barrel but the overall length is still only 42".
That is 2" shorter than a M98 action with a 24" tube.
The load was:
Hornady Brass
270gr Jacketed round nose bullet.

78.5grs H414
All touched off by a winchester large rifle mag. primer.

Sounds like a great load, checkout the spizsters though, I doubt your RN will expand at your 400yard velocity. With an accubond 260 you'd probably be good out to 500 if the accuracy is there. What a rifle for the mountains, good for grizzly and sheep, cool.
Click to expand...
 
Halfton said:
If you have some, try some Reloader 15 or Win 760 with your 375 H&H, and 270 grain bullets. I have had fairly good results with both those powders.

Jim
Click to expand...

The OP used H414. Isn't that the same thing as Win 760?

So far all I've tried is IMR 4350 and H4350 with with my 375 H&H and 270 grain bullets. I would like to try H414/ Win 760 and R15. I'm still trying to get better groups but the lead is expensive!
 
The 4350's are to slow even with the 300gr. bullets. H414/760 or RL17 gives top velocity. And CZ Brno is correct....it's a little pricey chucking copper and lead with a 375.
 
Kind of weird how that works eh? H414/760 is slightly faster, but Accurate 4350, H4350 and Reloder 17 all have the same burn rate. IMR4350 and Reloder 19 are slightly slower yet and have the same burn rate. All of these powders are very close in burn rates on the chart anyway. http://www.lapua.com/upload/reloading/reloadingburningratechart2011.pdf

I suppose comparing burn rate is only a basic guideline anyway right? Other factors get thrown in because different powders behave differently because of grain size, bulk density, and so on.
 
I just started shooting Sako Kodiak in 375 with Hornady 250 gr GMX Superformance. Fired 11 rounds to sight in scope and 3 had damaged necks. They were torn at the end of neck. Don't want to high jack your thread but any idea what this could be? Could they be over annealed? Thanks in advance.
Gary.
 
I'm going to work up a load with RL17 for my 375 H&H under 270gr Hornady Interlocks. I have gone up to 81.5 H4350, but seemed a bit slow. We'll see.
 
I have found that RL 15 is magic in my 375 H&H. I tried it when I could not get enough IMR 4350 or RL 17 in the case to even begin to see any pressure signs. I get 2900+ fps using RL 15 with a CCI 250 and 270 gn Barnes X bullets in R-P cases. I have used this load in 55 degree heat without any adverse effects at all.........well except to the critters I pointed it at, they showed significant adverse effects..........so much so that they all expired immediately.

Just as an aside, I have found in 3 different cartridges (375 H&H being one), that RL 17 does not like to be compressed and becomes erratic, showing pressure signs with an increase of just one grain, and a drop in velocity. I found RL 19 to act the same.
 
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Re17 seems to have a burn rate similar to H4350. Might not be quite fast enough in the 375 long tapered case to get highest speeds with 270gr bullets - if that's the objective - so Re15 should work a bit better for that purpose.

Got a supply of 270gr TSX bullets. Should work up an accurate load within the specified maximum pressure limit. Barnes #3 lists 2784 fps MV for a 24" barrel using 76.0 grains of Re15. My Kodiak has a 21-1/4" barrel. Probably 3 inches x ~25 fps loss per inch of reduced barrel length, or about 75 fps less so likely within the specified maximum pressure limit at about 2650 to 2700 fps with Re15. And provided accuracy is within MOA. :)

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http://www.saami.org/specifications_and_information/publications/download/Z299-4_ANSI-SAAMI_CFR.pdf
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Interesting how CIP (COMMISSION INTERNATIONALE PERMANENTE POUR L'EPREUVE DES ARMES A FEU PORTATIVES) specifies and regulates maximum pressure standards for ammunition. CIP’s recommendations have force of law whereas ANSI Z299.4/SAAMI's don't because it's a voluntary manufacturer's association.

CIP stipulates ammo to be pressure tested to 25% higher than the specified maximum pressure to define a proof pressure which implies a safety margin is established.

http://www.cip-bobp.org/homologation/en/tdcc_public?page=2&cartridge_type_id=3

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M = 25mm
PT max = 4300 bar = 62,366 psi (SAAMI/ANSI specifies 62,000 psi maximum)
PK = 1.15 x PT max = 4945 bar = 71,721 psi
PE = 1.25 x PT max = 5375 bar = 77,958 psi
 
CZ_Brno said:
Kind of weird how that works eh? H414/760 is slightly faster, but Accurate 4350, H4350 and Reloder 17 all have the same burn rate. IMR4350 and Reloder 19 are slightly slower yet and have the same burn rate. All of these powders are very close in burn rates on the chart anyway. http://www.lapua.com/upload/reloading/reloadingburningratechart2011.pdf

I suppose comparing burn rate is only a basic guideline anyway right? Other factors get thrown in because different powders behave differently because of grain size, bulk density, and so on.
Click to expand...

I've used Re17 in several different cartridges and it has always been slightly faster than H4350 - about mid-way between H414 and H4350. At a glance, you should be able to employ full cases of H414, Re17 and H4350 in the 375 H&H with most 270 gr bullets.

There aren't many published loads for it, but I have used Superformance a fair bit, and found it to be a bit slower than H4350. Being that Burn Rate and a dense ball powder, a full case of it in the 375 H&H with a 270 might produce near top MV's at a modest pressure.
 
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