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375 HH Mag Load for 300 gr Barnes TSX with H4350
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Picture of Mike_Dettorre
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Anybody have any data...

Barnes # 4 shows nothing

Barnes # 3 shows nothing

Hodgdon website shows a max of 75(c) grains but that is for the 270 grn TSX. However, that load is only operating at 43000 CUP and the spec for the 375HH is 53000 CUP. Additionally, the load only has a velocity of 2465 fps. Most 375 HH 270 grn max loads are 2650+. In fact all but one of the loads on the Hodgdon site for 270 grn TSXs are sub 2550.

I was thinking that about 70 grains would be a and estimated max for the 300 grn TSX. I came up with 5 grain reduction by looking at the Barnes #4 manual and seeing what the max charge drops were between 270 gr and 300 grn TSX bullets for a series of powders and it runs about 5 grs.

So I was going to start at 65 grains and work up in 1/2 grn increments stoping at 70.

What has me scratching my head is that the Hodgdon website shows 81.5(c) as the max for a 300 grn sierra. Now I recognize that the TSX is longer but I would not expect the need for their to be a 10+ grain difference in max or estimated max beween a TSX and standard bullet.


Thoughts?


Mike

Legistine actu quod scripsi?

Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.




What I have learned on AR, since 2001:
1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken.
2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps.
3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges.
4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down.
5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine.
6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle.
7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions.
8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA.
9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not.
10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact.
11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores.
12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence.
13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances.
 
Posts: 10181 | Location: Loving retirement in Boise, ID | Registered: 16 December 2003Reply With Quote
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Why H4350? Do you have 10lbs laying around that you want to burn up?
I think your methodology is both safe and sane. FWIW here are the mins and max for H4350 for 300gr bullets from my Load Notes book:
Bullet Min Max
Speer 75.0 79.0
Sierra 77.0 81.5
They also list a number of IMR4350 loads
Hornady 71.3 77.2
Nosler 71.0 75.0
Sierra 71.6 78.7
Speer 75.0 79.0
Note that this is an older book so work up with caution.
My usual method is to look up a powder not listed for a particular load in the Relative Burn Rate section that is close to the same as one of the listed powders and back off a little from that and start working up while looking for pressure signs and checking velocity.
BTW I don't think the difference in pressure is nearly as much with the TSX as it was with the old X bullets.


Have gun- Will travel
The value of a trophy is computed directly in terms of personal investment in its acquisition. Robert Ruark
 
Posts: 3831 | Location: Cave Creek, AZ | Registered: 09 August 2001Reply With Quote
One of Us
Picture of Mike_Dettorre
posted Hide Post
Yep 8 lbs of H4350 laying around


Mike

Legistine actu quod scripsi?

Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.




What I have learned on AR, since 2001:
1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken.
2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps.
3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges.
4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down.
5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine.
6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle.
7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions.
8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA.
9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not.
10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact.
11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores.
12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence.
13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances.
 
Posts: 10181 | Location: Loving retirement in Boise, ID | Registered: 16 December 2003Reply With Quote
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