For those of you that shoot and hunt with the great 375 H&H. What is the fastest a 300 gr bullet can go out of a 375 H&H. Some books say
2500, others say 2620 and both loads are near the same.Both are around 76 to 78 grs.Whats a fast fps?

I think you should be able to get 2550-2600 fps out of a .375 H&H using 300 gr bullets. I wouldn't think you need to go any faster as this cartridge made it's reputation at the 2535 fps level that is currently loaded by the factories.

Geronimo

Thanks

I have found with the 375 that with accurate loads powders such as Varget and 4064 will be about 2450 or so.

I don't know about the current lots of IMR 4350 but 82 grains in Model 70s with their 24 inch barrels would go about 2620 plus with 82 grains which is a very compressed load when using the 300 grain Hornady round nose.

Reloader 15 at about 73 grains is top load and will hit 2600 and without the compression.

78 grains of Win 760 is usually around the 2450 plus mark.

The Chrony brand chronograph often gives high readings as compared to Oehlers and varying light conditions seem to be the culprit.

One of the reasons that the various 375 Improveds such as the 375 Wby are quite a bit faster than the 375 than the inrease in case capacity would suggest is that with 300 grain bullets (especially spitzers) is that in the 375 H&H the Varget/4064/4320 is a bit too fast and the 4350 burn rate is a bit too slow for the 375.

Mike

I agree with Geronomo and Mike378's comments. My pre-64 with a 25" barrel knocks the 300 grain Nolers at a comfortable 2600 plus or minus depending on loads. The question is really why try to boost the 375 H&H above 2600? Normally you start to deal with unexpected results and inconsistent loads. Let's just say "been there done that" and finally realized the venerable 375 H&H can perform without being a super hero. Tried the other 375's to only return to old veteran that kills elk/moose/bear just fine and leaves a smile on my face.

Doesn't Hornady claim 2700 for their 300-grain Heavy Magnum .375 H&H load? Not that this should be attempted with any canister powder, but that seems about the same as a .375 Weatherby.....

I have reloaded for this rifle and used it extensively in Africa and can state with experience that it will kill whatever you shoot with a 300gr bullet at 2500fps. There is not significant benefit in going faster with the 300gr bullet.

What took a lot of time was having to work out synchronizing all the loads to shoot to the same POI with the same sight settings. This requires juggling bullets, powders and velocities.

What you learn is that ph's won't let you shoot most of the stuff you'd use 300gr bullets on at long ranges, and at close ranges, under 100yds, a 300gr 375 bullet will penetrate end to end most anything you'll ever point it at with velocities from 2400fps up. Velocity is the least of your worries. Kudude

Shooting a 300gr bullet at 2500fps in most 375 H&H rifles isn't to bad recoil wise but moving up to 2600fps in most rifles increases the recoil to the point where it is no longer "fun" to shoot. If you can take the recoil at 2600fps I'd suggest moving up to something like a 416 RemMag instead.

quote:

Originally posted by Geronomo:
I think you should be able to get 2550-2600 fps out of a .375 H&H using 300 gr bullets. I wouldn't think you need to go any faster as this cartridge made it's reputation at the 2535 fps level that is currently loaded by the factories.

Geronimo

Excellent reply.....great.

I clocked this load I've been working on. With IMR 4350 behind a 300 gr Serria with my Sako 375 H&H Hunter 75 it did 2648fps. I don't think that's fast enought to hurt anything. There was
nothing that had excess pressure. As a matter of fact this load is in Lyman 48th reloading
Handbook. I just wanted to make sure it was safe.
The 4 shot group was 5/8" at 100 yds.

DB Bill
I own a Rem 416. I have plans to go to Africa
in 07 if nothing changes my mine, like sickness or an accident of some kind.