Fixin' to load up some 375H&H

[Swamptrudger]

Got some new Norma brass, and a box each of 270 boat tail Speer and Barnes 300 banded solids.
Hopefully the IMR4350 will do ok, because that's what I've got, and got enough of to boot.
Not really looking to make up real hot loads, just 2550ish to 2600, so hopefully in a week I can shoot the new rifle.

 

[HuntingGold]

IMR 4350 will do just fine. Keep us informed

 

[PHOENIX PHIL]

IMR4350 is my go to powder with 300gr projectiles in my M70 .375HH. Not sure how well it will work with 270gr bullets. I go to H4895 for 250gr bullets if that's of any use to you.

 

[Luvthunt]

IMR 4350 rather the powder of history in the 375hh. I was using it 40/50 years ago and still do today.

 

[cash_tx]

I'm about midstream on a load work-up with 375H&H using Barnes 300gr TSX and IMR 4350. I may go a high as 74 grains of charge, but found a node at 71.0 that's producing 1/2" 3-shot groups at 100 yards. This is very promising already, but I still need to test some higher charges, but no pressure signs so far.

 

[jnmullins]

IMR 4350 has worked very well for me in my M70 375 with 260gr Partitions, along with H4350 and RL15. It is a great powder.

 

[WyoBull]

I load RL15 in my 375H&H with 300 gr Barnes TSX.
I never tried IMR4350 because the RL15 proved to be so accurate in my rifle. But, it is good to know about the 4350 if I ever run out of or can’t get RL15.

 

[Edster]

I load RL15 in my 375H&H with 300 gr Barnes TSX.
I never tried IMR4350 because the RL15 proved to be so accurate in my rifle. But, it is good to know about the 4350 if I ever run out of or can’t get RL15.

I’ve only seen RL15 on a few occasions over the past few years. Just saw some recently @ $62.00 a pound. I’ll be doing some test runs with 4350 soon.

 

[Swamptrudger]

Dies arrived! Since the brass chambers easily, just neck sizing tonite

 

[Swamptrudger]

Just thought I'd take a moment to share a few things.

My lot of Norma 375H&H cases hold 83.4 grains of my lot of IMR4350

For the 270g boat tail Speer, the Speer book shows a "max" of 80g IMR4350 compressed, I'm starting at 76.5 and it fills the case to the bottom of the neck.

The 270g Speer boat tails weighed in at 269.8 to 270.2, which I'm guessing while not great, is acceptable deviation.

I neck sized only, since all the brass easily chambered.

The freebore is ... well, I rammed one home after it hit the rifling, and got 3.83 COL. I'm not sure what to make of that, except it's probably set to take solids which have much flatter ogives, and usually wide meplats.

The magazine box of my new production Model 70SE will not really take 3.600 COL. More like 3.595 barely fits, which is fine I guess.

To achieve 3.6 or 3.595 COL, I've got the die fully against the shell holder and the seating stem holding on to about 2 threads of the retaining nut. I've got to get the die shortened. HDS will do that for something like $10 plus return shipping. I'm thinking take off .1 inches. Nix that, just found out that HDS has closed shop. I find that distressing as I used to have a good relationship with them, being the "custom shop" of RCBS (same building, just retail store up front). I'm sure I can find a local outfit with a surface grinder and a beer thirst....

That's all I got. Only loaded up 5 rounds. I'll see what happens, how they shoot, and decide what's next.

 

[8x68]

H4350 & IMR 4350 worked well for me when creating handloads. Best groups of under an inch were achieved in the 2500-2600fps range. Bullets used were Hornady 300gr RN and Hornady 300gr FMJ as it's all I have in that weight.
IMR 4350, IMR 4064, IMR 3031 worked well for the 270gr Hornady Spire Points as well. Groups were under an inch. Velocity was around 2700fps.
I have yet to shoot anything meaningful, but several groundhogs were on the receiving end of a few 270gr & 300gr pills.
Rifle: BRNO 602

 

[Inline6]

I'm using H4350 for 300gr.

 

[Luvthunt]

Have used re15 behind the 260 partition for a Labradar fpm of 2800. Great groups. But the 4350 are my go to for 300 gr.

 

[matt vejar]

This is what my brother loads for me.
Winchester Fail Safe and Swift A Frame. Winchester Model 70 Pre 64.
Tack Driver