Desirable Powders For 300 Grain Swift A-frames, For .375 H&H Magnum?

ddog

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Varget works for me- shoots small groups in 3 different 375s all with swift 300 A-Frames.

The 375 is and easy caliber to load I think my load was 67.5 grains of varget so right at 2500 fps- just go by the swift book.

Also have had good luck with IMR 4064 with Hornady RN bullets.
 

WAB

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I use H414 with good results.
 

bruce moulds

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many powders will go bang.
some drive bullets faster with less pressure.
with 375 h&h and 300 gn bullets, varget comes under the former heading due to burning rate.
bruce.
 

John J

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Page from Swift manual. 76.0 H4350 worked best in my MRC at 2,582 fps. 5 in 1 1/4”.
View attachment 386278
Hello. If I may ask, are there any more pages of info in the Swift manual for the 375 H&H? I have 300 gr A frames pulled from a RUM for a wildcat. My son's 375 should be back from AHR soon and would like to set him up with those bullets. I can't find the manual available thus far. Thanks John
 

C.W. Richter

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RL15
 

meigsbucks

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I was only getting fair accuracy with a 300 gr Barnes. Then I tried WW748. sub 1” groups. RL15 or H4895 with the 300 gr Swift.
 

Ridgewalker

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Hello. If I may ask, are there any more pages of info in the Swift manual for the 375 H&H? I have 300 gr A frames pulled from a RUM for a wildcat. My son's 375 should be back from AHR soon and would like to set him up with those bullets. I can't find the manual available thus far. Thanks John
PM sent. Check your “conversations”.
 

Trogon

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Got lucky this weekend, picked up a pound of RL-15 at a store between Cincinnati and Columbus, Ohio.
(https://archery-stores.cmac.ws/bottom-dollar-gun-archery-professional-shop/1313/). Lots of shotgun and pistol powders, not a bad supply of rifle powders. A guy I work with got me a pound of RL-17 in western Kentucky. And one of my cousins was able to get 2 bricks of primers (Federal Large Rifle Magnum) that we'll split, $40 a brick. I'm not trying to gloat, especially since times for finding anything useful are really difficult, just relieved to actually get some needed stuff. Got it all by just talking to people.
 

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Ridgewalker

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Got lucky this weekend, picked up a pound of RL-15 at a store between Cincinnati and Columbus, Ohio.
(https://archery-stores.cmac.ws/bottom-dollar-gun-archery-professional-shop/1313/). Lots of shotgun and pistol powders, not a bad supply of rifle powders. A guy I work with got me a pound of RL-17 in western Kentucky. And one of my cousins was able to get 2 bricks of primers (Federal Large Rifle Magnum) that we'll split, $40 a brick. I'm not trying to gloat, especially since times for finding anything useful are really difficult, just relieved to actually get some needed stuff. Got it all by just talking to people.
Envy!
 

John458Lott

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yes but at more pressure than necessary.
once you get 300 gn bullets up to and over 2550 in the h&h you are talking pressure potential.
h4350 (ar2209) makes this issue go away.
bruce.
Agree with Bruce and I also use H4350/AR2209 with 300gr Woodleighs Softs and Solids. Most importantly both shoot to same point of impact. However in my Winchester cases and bullets seated to cannelure it's somewhat compressed loads. That's the only proviso but not really any issue of significance and as Bruce says excellent accuracy and velocities right on 2550fps.
 

bruce moulds

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in my 375 and other rifles i load to max length that will fit in the mag.
doing this 75 to 76 gns 2209(h4350) went to around 2550.
do not worry about compressing powder if you work up to the load.
i repeat, 4895, 4064,varget(2208) and re 15 are too fast for 300 gn bullets at factory speed in the 375 h&h.
just because guys use them does not mean they are good.
it just means that guys are running more pressure than they need.
bruce.
 

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