more H&H 300 caliber variations

[RCS]

More variations and am certain there are more, The US Army testedAttachment 115679 the last two on the far right for long range sniping back around 1959-1960

Information

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[browningautorifle]

They sure would get the job done, I'll bet they can do at 900 what a .30 cal can do at 600. Likely with a 30% heavier bullet too.

[usabaker]

More variations and am certain there are more, The US Army tested the last two on the far right for long range sniping back around 1959-1960

This is awesome information. I shot the 300 H&H for the first time this week with reloads that I built I loaded 59 grains of IMR 4895 the standard deviation was terrible at 49.2. I was surprised at how smooth the recoil was using the Remington 721.

Description: 300 H&H Sierra 168gr HPBT 59gr
Distance to Chrono(FT): 8.00
Ballistic Coefficient: 0.462
Bullet Weight(gr): 168.00

# FPS FT-LBS PF
9 2963 3275.58 497.78
8 3025 3414.09 508.20
7 2988 3331.09 501.98
6 3057 3486.71 513.58
5 2999 3355.66 503.83
4 3008 3375.83 505.34
3 3048 3466.21 512.06
2 3102 3590.11 521.14
1 3104 3594.75 521.47
Average: 3032.7 FPS
SD: 49.2 FPS
Min: 2963 FPS
Max: 3104 FPS
Spread: 141 FPS
Shot/sec: 0.0
True MV: 3037 FPS
Group Size (in): 1.53

[RCS]

The 300 H&H was necked down as a factory cartridge called the 244 H&H mag for hunting in Scotland. During the 1930's and 1940's Elmer Keith and his friends O'Neil and Hopkins also used the 300 H&H case to design the 334 OKH (which years later became the basic 338 mag)

Griffin & Howe designed their own cartridge the 350 G&H magnum based on the 300 H&H

cartridges in my first photo : 222 rimmed, 5,6x61 Vom Hofe, 244 H&H and 5,6x57 RWSAttachment 115680Attachment 115681

[jon_norstog]

This is awesome information. I shot the 300 H&H for the first time this week with reloads that I built I loaded 59 grains of IMR 4895 the standard deviation was terrible at 49.2. I was surprised at how smooth the recoil was using the Remington 721.

Description: 300 H&H Sierra 168gr HPBT 59gr

Average: 3032.7 FPS
SD: 49.2 FPS
Min: 2963 FPS
Max: 3104 FPS
Spread: 141 FPS
Shot/sec: 0.0
True MV: 3037 FPS
Group Size (in): 1.53

That is a lot of variation. I load for 30-40 mainly, weighing charges and using a powder trickler to get them spot-on, My scale will react to a single granule of 4350, so I know the charges are uniform. Yet when I chrono a string of loads I get over 100 fps spread from lower to higher.

I also load black powder for my 45-70. There my spread on a string of shots is 15-20 fps.

Maybe it's the primers? Some of mine have been kicking around my shop for a while.

jn

[usabaker]

Maybe it's the primers? Some of mine have been kicking around my shop for a while.

Hi Jon, It could be the rifle didn't like the 168gr bullet and 59 grains of IMR 4895 combo.. I should have worked up several loads but I just wanted to get this rifle out to the range and 59 grains of IMR 4895 was a "safe" load. The primers are less than a year old, If its a component, I'd guess the powder which is a bit old. The old IMR tin can stuff I can't even remember when I bought it.

I'm all out of 4350 but I have a boatload of Hybrid 100 V and H4831 so I'll try one of those powders next time.

Attachment 116190