.300wm + H4350

blargon

blargon

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Anyone running this combo with 180gr bullets? I'm loading some for a Win 70 with a 26" barrel. Running 2950fps with 65.5gr, but the powder doesn't even touch the bullet.

Just wondering if there would be a negative effect on the burn, with an air gap while the shells are horizontal. I've ony fired a few rounds.
 
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There's plenty of powder in there to not have to worry about 'flashover' if such thing exists.

Theoretically, the best internal ballistics happen with the highest load density; read> somewhat compressed charge. That of course also depends on your barrel, chamber and pressure levels.

You don't say what bullet you're loading, but max load in the Lee manual for a 'jacketed bullet' is 67gr. Some loads I ran through QuickLoad show powder charges over 70gr without overpressure, but that is VERY dependent on your gun.

FWIW, QuickLoad shows great velocities and efficiency with H4831SC in charges up to around the mid 70gr ranges, with excellent LD also.
 
blargon said:
Anyone running this combo with 180gr bullets? I'm loading some for a Win 70 with a 26" barrel. Running 2950fps with 65.5gr, but the powder doesn't even touch the bullet.

Just wondering if there would be a negative an effect on the burn, with an air gap while the shells are horizontal. I've ony fired a few rounds.
Click to expand...

I shoot 67 grains of H4350 under a 180 grain bullet, no signs of pressure in my rifle. (Rem 700 300 WM)
 
Running 180 partitions. The Hodgdon data shows 67gr max, with velocity at 2918fps. I worked up to 66.5gr but had very flat primers, and velocity was a 3000fps.

I'm going to try a few groups for accuracy and then see if I need a slower powder.

thanks for the input.
 
Silverado said:
There's plenty of powder in there to not have to worry about 'flashover' if such thing exists.

Theoretically, the best internal ballistics happen with the highest load density; read> somewhat compressed charge. That of course also depends on your barrel, chamber and pressure levels.

You don't say what bullet you're loading, but max load in the Lee manual for a 'jacketed bullet' is 67gr. Some loads I ran through QuickLoad show powder charges over 70gr without overpressure, but that is VERY dependent on your gun.

FWIW, QuickLoad shows great velocities and efficiency with H4831SC in charges up to around the mid 70gr ranges, with excellent LD also.
Click to expand...

I've been loading the winny for quite a while and I have had the best combination of velocity and accuracy with reloder 22, significantly better than H4831sc. I got good but spiky results from H1000. IMHO H4350 is just a bit too quick for the 300 win, better for the 30-06.
 
I load IMR 4350 w/ 168 gr TSX for a 300 Win. Accuracy is excellent and 3150 fps speed, 26" tube, I think it's 72.0 grs
 
@ blargon: The partition does demand a lower powder charge in most cases.

@ Martin: X2 on the powders you mention; I too think 4350 isn't as ideal as some others in a WM. It is widely used however.
 
todbartell said:
I load IMR 4350 w/ 168 gr TSX for a 300 Win. Accuracy is excellent and 3150 fps speed, 26" tube, I think it's 72.0 grs
Click to expand...


I get 2950 with 190 grainers out of the 300 without any pressure signs at all. Accuracy is excellent and the tube is 24 inches,it doesn't make a lot of sense to have a big gun and shoot dinky lil boolits out of it. May as well stick with the 06......
 
todbartell said:
I load IMR 4350 w/ 168 gr TSX for a 300 Win. Accuracy is excellent and 3150 fps speed, 26" tube, I think it's 72.0 grs
Click to expand...

I'll second the motion for IMR4350. My best ever load for the 300 winmag is IMR4350 (71 gr.)and 180 gr partitions that hit 3050 fps in my 24 in tikka 695. I tried heavier charges with no pressure signs, but was not not getting a corresponding increase in velocity and accuracy was degrading, so i settled on the 71 gr load. It is a very good match with the 180 gr. partition bullet.

I experimented with H/IMR 4831, but couldn't match the velocity or accuracy i got with IMR4350. I think the 46th lyman manual (+/- 1985) lists IMR4350 as one of the fastest and most accurate powders they tested with 180 gr bullets in 300wm.
 
"...powder doesn't even touch the bullet..." Doesn't need to. Go shooting. Mind you, you should work up the load. Not just pick one.
 
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