'06 150GMX@3140 fps w/60gn H4350 Want 3000fps+

[emerson]

Too quick for me; also slight pressure signs+#### accuracy. How
much powder do you think I should drop? Want to a avoid
wasting premium bullets. SSTs are 3040fps w/60gr
H4350. Yes, I'm using a manual. Preachers please refrain
from wasting your time, thank you.

 

[Andrzej]

I've noticed that loading for 30-06 with 150 gr GMX and seating them 0.05 from lands created more pressure than SST using IMR and H 4350 with similar charges , so instead I've used 150 TTSX and both SST and TTSX are about 3000 ft/sec .
I was planning to play with seating depth of GMX a bit but having TTSX shooting very well in my three 30-06 I am not wasting my powder just to prove a point.
59 -60 gr of either IMR or H 4350 is definitely max in my Sako's with 150 gr bullets.

BTW accuracy of GMX was 1.5" at 100 at the best.

 

[hometownhero]

I am loading 59.5gr of h4350 and getting 3005 fps. Not a sign of pressure. Also getting under an inch easily. I use the 165gr more though and they are shooting at .5 to .8" Thats sst/gmx/interbond.

 

[emerson]

I've noticed that loading for 30-06 with 150 gr GMX and seating them 0.05 from lands created more pressure than SST using IMR and H 4350 with similar charges , so instead I've used 150 TTSX and both SST and TTSX are about 3000 ft/sec .
I was planning to play with seating depth of GMX a bit but having TTSX shooting very well in my three 30-06 I am not wasting my powder just to prove a point.
59 -60 gr of either IMR or H 4350 is definitely max in my Sako's with 150 gr bullets.

BTW accuracy of GMX was 1.5" at 100 at the best.

Thanks for the info. Hopefully they can be accurate. I'll drop 2 grains and try and find the same accuracy node I did with the SSTs. I've got 92 more GMXs that I'd rather not waste, considering the cost.

 

[emerson]

Thanks for the info. Hopefully they can be accurate. I'll drop 2 grains and try and find the same accuracy node I did with the SSTs. I've got 92 more GMXs that I'd rather not waste, considering the cost.

Reviewed the data this morning. I'll drop 2.5 grains and try to find the node at 3k that the SSTs like.

 

[emerson]

Dropped 3 grains, down 145fps

Loaded 57gr H4350 w/150gr GMXs and ended up at 3000fps vs. 3145fps at 60 gr. On a side note using Hornady brass dropped 100fps vs. Win brass. (Thinner brass=less pressure I'd guess).60gr H4350 w/SSTs puts me at 3045fps where the GMXs where at 3145fps. I had a very good group with the 60gr and GMXs, but probably got lucky. The 57gr group was good too. I'm reaching the limitations of my cheap front bag, non-precision/tactical stock setup. I guess under 1 MOA@222yds with a VXII on a stock Savage 116 when I do my part isn't bad. Time to head back to offhand shooting for humility.

Note:For those on the fence, a chrono is critical to useful handloading. Without sound data accuracy experimentation is almost pointless.

 

[sunray]

"...w/60gr H4350..." Thats way over max for one bullet, but not for another 150. Friggin' daft. In any case, no game animal will know or care how fast the bullet went. Accuracy is the only thing that matters.
"...a chrono is critical..." Nonsense. They're nice to have, but far from being critical. Velocity doesn't mean a whole lot to accuracy.

 

[emerson]

"...w/60gr H4350..." Thats way over max for one bullet, but not for another 150. Friggin' daft. In any case, no game animal will know or care how fast the bullet went. Accuracy is the only thing that matters.
"...a chrono is critical..." Nonsense. They're nice to have, but far from being critical. Velocity doesn't mean a whole lot to accuracy.

Sunray, as always, a lot to say and little useful to add. Thanks for coming out;-/ My experience is for the benefit of those still learning. Consistency is the only thing that matters. My manual goes to 60.5 gr of H4350 with 150s. With the SST my results are quite close, with the GMX over max. I wouldn't be able to identify the precise difference between them if I didn't have a chrono. 150fps can be hard to pin down without a precision rifle and conditions to calculate actual velocity by drops, without error factors becoming too large. The chrono also tells me the velocity difference between different brass and primers too. Velocity means everything to accuracy. Not max velocity, but tracking different results for consistency. Also my VXII reticle is calibrated for a 150@3000fps. Thats why I need to establish my actual velocity. Guesses don't make for accurate or consistent shooting. In the future you can skip my posts; I'm sure there is little knowledge I can give you.

 

[hometownhero]

In the 2012 hornady catalog they say that the sst, gmx, and interbond can all be loaded the same and all fly the same. My results with 165 are pretty close.

 

[emerson]

In the 2012 hornady catalog they say that the sst, gmx, and interbond can all be loaded the same and all fly the same. My results with 165 are pretty close.

I haven't tried the Interbond, but the GMXs in 150 are flying 110fps faster for me, although without a comparator I might be getting more pressure from being close to the lands. One more thing to add to the tool kit.

 

[hometownhero]

I haven't tried the Interbond, but the GMXs in 150 are flying 110fps faster for me, although without a comparator I might be getting more pressure from being close to the lands. One more thing to add to the tool kit.

Oh gotcha. My 165's are 15 fps difference between the sst and gmx/interbond. I have a comparator on the way as well.

 

[Ltbull01]

"...w/60gr H4350..." Thats way over max for one bullet, but not for another 150. Friggin' daft. In any case, no game animal will know or care how fast the bullet went. Accuracy is the only thing that matters.
"...a chrono is critical..." Nonsense. They're nice to have, but far from being critical. Velocity doesn't mean a whole lot to accuracy.

So, you don't think that a load for one bullet can be way over max but not for another? Confused...

Chrony not critical? Except if your MV's are showing a great ES then what may be accurate at 100, 200, and maybe 300, can be very problematic at longer ranges. A chrony will show that for you without having to fire (and waste) a whole lot of groups in this limited component era. It will also show potentially dangerous spikes. Yes, you can still develop loads but you are seriously handicapping yourself without a chrony.

 

[Eagleye]

One of my 30-06 rifles [Lazerguard] loves the 150 GMX and Reloder 17.
Very nice groups and very attractive velocities.

Have not shot any game with it yet, but this fall, I will. Dave.

 

[Cleftwynd]

So, you don't think that a load for one bullet can be way over max but not for another? Confused...

Chrony not critical? Except if your MV's are showing a great ES then what may be accurate at 100, 200, and maybe 300, can be very problematic at longer ranges. A chrony will show that for you without having to fire (and waste) a whole lot of groups in this limited component era. It will also show potentially dangerous spikes. Yes, you can still develop loads but you are seriously handicapping yourself without a chrony.

That was 2.5 years ago, and he is banned, don't think he will read this. Lol

however I do agree with you.

 

[emerson]

I'm still using the same load, but my stock of 150GMXs is low. Depends on how this season goes and when a 375 shows up whether I buy more 150GMX.

 

[Ltbull01]

That was 2.5 years ago, and he is banned, don't think he will read this. Lol

however I do agree with you.

I saw the date afterwards... realized I maybe should have passed on commenting on the thread. But, I have a 30-06 and am thinking 150GMX bullets so searched for same and came across this!

 

[shorttrac]

I use 59 grains h4350 with 165 SST with no pressure signs, sorted and weighed brass, for 2900 FPS and es under 15fps in a vanguard. 3" groups at 300 yards. Highly doubt it would be to high pressure for a 150. Doubt you would even get enough powder in to be over pressure

 

[emerson]

I use 59 grains h4350 with 165 SST with no pressure signs, sorted and weighed brass, for 2900 FPS and es under 15fps in a vanguard. 3" groups at 300 yards. Highly doubt it would be to high pressure for a 150. Doubt you would even get enough powder in to be over pressure

Chrono says 3140fps with 60H4350 and 150GMX. YMMV.