.300 H&H Magnum

Infobox Firearm Cartridge
name= .300 H&H Magnum


caption=
origin=flagcountry|United Kingdom
type= Rifle
service=
used_by=
wars=
designer= Holland & Holland
design_date=1920
manufacturer=Holland & Holland
production_date=1920
number=
variants=
is_SI_specs=
parent=.375 H&H Magnum
case type=belted tapered
bullet=.309
neck=.338
shoulder=.450
base=.513
rim_dia=.532
rim_thick=.220
case_length=2.850
length=3.600
rifling=1-10"
primer=large rifle magnum
is_SI_ballistics=
bw1=150
btype1=GRSL
vel1=3362
en1=3766
bw2=165
btype2=SP
vel2=3213
en2=3783
bw3=180
btype3=SP
vel3=3077
en3=3785
bw4=200
btype4=HPBT
vel4=2913
en4=3769
bw5=220
btype5=RN
vel5=2743
en5=3676
test_barrel_length=26"
balsrc= [http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/375Cal(9.53mm)/375%20Holland%20&%20Holland%20pages%20322%20and%20323.pdf Reloading data at Accurate Powder]

The .300 Holland and Holland Magnum Cartridge first became available in 1925. [http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/375Cal(9.53mm)/375%20Holland%20&%20Holland%20pages%20322%20and%20323.pdf Reloading data at Accurate Powder] ] The case was belted like the .375 H&H Magnum, and is based on the same case, as also is the .244 H&H Magnum. The belt is for headspace as the cases' shoulders have a narrow slope rather than an actual shoulder. More modern magnums continue this practice, but headspacing on the belt is not necessary with their more sharply angled shoulders. The cartridge won the international 1,000 yard competition in 1937, and Winchester chambered the Model 70 in .300 H&H in 1939.

The .300 H&H has what is referred to as the "H&H mystique". It is surprisingly soft-shooting, with a whoosh rather than the abrupt recoil and crack of the .30-06. Ballistically similar to a beefed-up .30-06, the .300 H&H is just as versatile with all bullet weights and types, especially if well-developed handloads are used. It excels with the heaviest .30 calibre bullets in the 180 - 220 grain range. SAAMI has set the pressure limit for this cartridge at 54,000 P.S.I. Its case length calls for a full-length magnum action, longer than for the .30-06. It is not nearly as popular as the .30-'06, and never was; but because of its mystique the .300 H&H keeps hanging on despite its repeatedly reported demise. The .300 H&H is an exceptionally fine African plains game cartridge, and suitable for all but the most dangerous big game and pachyderms.

ee also

* .30-06 Springfield
* .300 Winchester Magnum
* .300 Weatherby Magnum
* .300 Winchester Short Magnum
* .300 Remington Short Action Ultra Magnum
* .300 Remington Ultra Magnum
* 7 mm caliber

References

[http://www.chuckhawks.com/subscribers/rifle_cartridge_page/300Holland.htm The .300 Holland & Holland Magnum by Chuck Hawks (subscription req)]

External links

* [http://www.chuckhawks.com/300Holland.htm The .300 H&H Magnum by Chuck Hawks]