H-375?

jsmith15

I bought some reloading supplies from a guy and he gave me some H-375 powder. I can't find much on it. What powder is this compariable to? It is still sealed and obviously old. Is it safe to load and shoot?

XXCross

Haven't seen or used any H-375 since the 60's. If you have a specific Ctg. in mind I might be able to dig up some load data. Some of the early Speer loading manuals had some listings, but the powder wasn't on the market very long and didn't have a great following. I is a ball type powder and has a VERY long shelf life if it hasn't been improperly stored...too much heat or moisture.

jsmith15

CAn I use it for .243, or 22-250? I assume it is a rifle powder

XXCross

It is a medium slow rifle powder and should work well in either ctg. If I can find data I'll post it or send you an E-Mail.

XXCross

Gleaned this from the net...saved myself a lot of digging.

H375 Powder Data

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From Handbook for Shooters and Reloaders, P.O. Ackley:

"General Information - Surplus Powders"

".Reduce first test load by 5% from highest shown. If air temperature is more than 20? above test temperature, reduce first test loads a second 5% (Note: Test temperature is not mentioned in book). Work back up in half-grain increments. If primers are loose or seat too easily on subsequent reloading of case, reduce charge about 4%."

Note: This was written by Hodgdon, himself

Loading Data For Spherical H375

Caliber - Bullet (gr.) - Powder Charge (gr.) - Velocity (fps)

.222 Remington
50 - 27.0 - 3033
55 - 27.0 - 3004
.222 Magnum
50 - 31.0 - 3408
55 - 30.0 - 3363
55 - 32.0 - 3534
55 - 33.0 - 3677
.22-250
50 - 40.0 - 3872
55 - 37.0 - 3555
60 - 36.5 - 3494
.219 Wasp
51.5 - 32.0 - 3512
51.5 - 33.3 - 3802
55 - 33.0 - 3609
.220 Swift
50 - 41.0 - 3798
55 - 39.0 - 3519
60 - 37.0 - 3323
.243 Winchester
75 - 40.0 - 3107
90 - 37.5 - 2858
105 - 35.5 - 2650
.244 Remington
70 - 46.0 - 3714
75 - 44.0 - 3501
85 - 40.0 - 3064
90 - 39.0 - 2935
105 - 36.0 - 2666
.257 Roberts
87 - 44.5 - 3148
100 - 42.0 - 2925
117 - 40.0 - 2659
.270 Winchester
100 - 57.0 - 3564
130 - 51.0 - 3078
150 - 49.0 - 2848
170 - 47.0 - 2574
7 x 57mm Mauser
139 - 41.0 - 2566
160 - 38.0 - 2377
175 - 37.0 - 2239
.30-'06 Gov't.
150 - 55.0 - 2888
180 - 50.0 - 2559
.303 British
130 - 47.0 - 2686
150 - 45.0 - 2582
.35 Whelan
180 - 63.0 - 2766

From Handloader's Digest, 3rd Edition:

"Do not use the MAXIMUM loads listed until lower charges have been fired without any indication of excessive pressure. It is recommended that you start by reducing these loads by at least 10%."

"'Maximum', here, is taken to mean those pressures which allow reasonable reloading of brass, normal working of action, etc. It is not intended to indicate pressures just under the bursting point of the gun or case."

MAXIMUM RIFLE LOADS

Caliber - Bullet (gr.) - Powder Charge (gr.) - Velocity (fps)

.222 Remington
40 - 27.5 - 3584
45 - 27.0 - 3420
50 - 26.0 - 3303
55 - 24.5 - 3209
.243 Winchester
75 - 37.5 - 3513
90 - 35.5 - 3225
105 - 35.5 - 3070
.244 Remington
80 - 40.0 - 3532
Reduce 6% for 6mm Remington
.257 Roberts
120 - 40.0 - 2863
.30-30 Winchester
170 - 37.0 - 2280
.219 Wasp
50 - 33.3 - 3802
55 - 33.0 - 3609
Above Wasp loads are maximum velocity.

From Handloader's Digest First Ed.:

"Spherical H375: Probably the best powder for the .219 Don. Wasp. It gives good performance in larger cases up to .30-'06. 1-lb. can $2.50, 20-lb. keg, $45."

jsmith15

Thanks for finding the info.