H4350 emulation

Malxwal · Mar 25, 2026

So, it's been a while since H4350 etc went off the menu. For those who used it, then had to replace it, which powder did you find best emulated it ?

Jura · Mar 25, 2026

Vhit N150 for my 375 H&H or Reloader 19 if you can get it.

Smellydog · Mar 25, 2026

4350 was so forgiving. Wonderful powder.

Triffid · Mar 25, 2026

RS62 for 6.5CM

Dillon · Mar 25, 2026

RL 16 or RS62 depending on the batch.

paul o' · Mar 25, 2026

As above R16 and RS60 .

Malxwal · Mar 25, 2026

I think the reality is, it has to be Viht or RS...

Norfolk Deer Search · Mar 25, 2026

Malxwal said:
So, it's been a while since H4350 etc went off the menu. For those who used it, then had to replace it, which powder did you find best emulated it ?

I’m still using it, got about half a tub left, I use it in my 7x57

I’m going onto N160, I do also have a tub of IMR4350 so I’ve got plenty to go out to keep me going for a long time

wytonpjs · Mar 26, 2026

I was using IMR4350 as my go to for .243 and .270 (and IMR4895 in my .308s and will be for quite some time

) and moved to using Vhit N135 in both

Norfolk Deer Search · Mar 26, 2026

Malxwal said:
I think the reality is, it has to be Viht or RS...

I think you’re right, the US powder market will dry up completely eventually.

wytonpjs · Mar 26, 2026

wytonpjs said:
I was using IMR4350 as my go to for .243 and .270 (and IMR4895 in my .308s and will be for quite some time ) and moved to using Vhit N135 in both

EDIT: Just checked and the above is incorrect - I moved the .243 from IMR4350 to IMR4895 too. It's only my .270 that I moved from IMR4350 to Vhit N135 :doh:

Malxwal · Mar 26, 2026

Wasn't it the case that H4350 and IMR4350 weren't actually completely interchangeable though ?

Jura · Mar 26, 2026

Malxwal said:
Wasn't it the case that H4350 and IMR4350 weren't actually completely interchangeable though ?

That was always my understanding.

Smellydog · Mar 26, 2026

Malxwal said:
Wasn't it the case that H4350 and IMR4350 weren't actually completely interchangeable though ?

Not quite, imr4350 was a hint faster.

Smellydog · Mar 26, 2026

wytonpjs said:
EDIT: Just checked and the above is incorrect - I moved the .243 from IMR4350 to IMR4895 too. It's only my .270 that I moved from IMR4350 to Vhit N135

N135 seems a bit fast for 270. Probably fine but not optimum.

wytonpjs · Mar 26, 2026

Smellydog said:
N135 seems a bit fast for 270. Probably fine but not optimum.

Working very effectively on fallow for me with 110gr TTSX giving me 3143 fps from a T3X 20" barrel and within a gnat's todger of the factory VOR-TX ammunition speed

Smellydog · Mar 26, 2026

wytonpjs said:
Working very effectively on fallow for me with 110gr TTSX giving me 3143 fps from a T3X 20" barrel and within a gnat's todger of the factory VOR-TX ammunition speed

Was thinking 130-140 gn bullets.
I use to get that velocity from a 20" 308....110gn vmax.

Malxwal · Mar 26, 2026

wytonpjs said:
Working very effectively on fallow for me with 110gr TTSX giving me 3143 fps from a T3X 20" barrel and within a gnat's todger of the factory VOR-TX ammunition speed

I run RS52 under 112.5 Yew Tree, previously 210 TTSX, in 270, 3350 from a 20".

wytonpjs · Mar 26, 2026

Malxwal said:
I run RS52 under 112.5 Yew Tree, previously 210 TTSX, in 270, 3350 from a 20".

110gr

Edinburgh Rifles · Mar 26, 2026

RS60 is IMO one the finest powders out there
Very forgiving
We use it from 243 up to some magnums
Meters well in progressive machines

H4350 emulation

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