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FINALLY I've had the opportunity to begin testing 120 NBT in my Win 70 FTWT 22"--6.5X55.

I'm using WW brass/ older, nickel plated, WW Primers, IMR 4831 powder over an Oehler 33 with NEW skyscreen IIIs.

I waited 6 mos for the bullets to come last yr and when they did it was tooo hot to mess with. Deer season came & went then we've had 3 months of March winds. frown This morning I was able to graph with cloudy skies, temp @ 65*. Great conditions.

I began by checking batteries in the O 33, NO low battery indicator. I used my Ruger 10-22 and Fed ammo to verify everything was working alright. CHECK !

After months of research and comparing load data for Modern Firearms I started with 46 gr IMR 4831 and slowly worked my way upward.

49 - IMR 4831 av 2760 fps --not acceptable to me.

50 - IMR 4831 av 2825 -- not bad but I'm looking for 2900-3000.
I have another LOT of IMR 4831 I'll try next PLUS IMR 4350.

50 grs is NOT too hot for MY rifle. Primers still tight. ALSO I found this in Handloading Big Game Rifles...

Denton
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Registered: 06/28/04

Campfire Pet Loads -- 6.5X55

49.5 grains H4350 with a 120 grain Sierra bullet and 3.000" COL gives me a measured 59.4 KPSI and 3075 FPS out of a 24" barrel. I back that one down a grain just for luck. Should give you about 3025 and around 57 KPSI,

****which is a conservative load for a modern rifle.****

47.5 grains H4350 behind a 129 grain Hornady bullet, 3.000" COL, gives 2951 FPS. I don't have a pressure measurement on that. Same 24" barrel.
Your results will be different, of course.
Edited by denton (12/28/14)
---------------------------------------------------------

IF - IF 49.5 grs H4350 gave less than 60,000 PSI--
THEN 50 grs IMR 4831 should be less than 60.000 PSI.

Next time I'll try another lot of IMR 4831 and IMR 4350

*************
Check This OUT
I shot a few rounds of Factory PRVI 140 SP over the graph.

2217, 2202, 2235, 2202 / 4 rounds told me ALL I wanted to know!!
That's good 30-30 speed right there. smirk frown

For curiosity and *satisfaction* I drug out my M 6, 30-06 with 165 HBTSP and H 205, yes-- H 205 whistle

2929, 2942, 2923---The graph WORKS right grin --PRVI SUX!

Jerry


Last edited by jwall; 04/30/16.

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I shot lots of 308 Win PRVI during the few years I wasn't reloading. 150g stuff clocked a consistent 2700fps which wasn't the worst for the money.

That 6.5 stuff is dreadful though. You could time it with your stopwatch!

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g'day Bob -

I'm going to DISmantle those PUNY rounds and TRY to use the brass.
I got 2 boxes of Prvi factory ammo when I bot the rifle.

I'll pull the bullets, pour the powder in flower beds, and DE cap the brass and destroy the primers I'll keep the 140s till I see if I want to use them and probably won't.

NO wonder 'some' like the 6.5X55 -- no recoil !! smirk
AKA no velocity. crazy


My 6MM Rem will push 100 gr bullets -3100 fps.

6.5 X55 - pftt pftt

Jerry


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47gr of H4350 gives me 2850fps out of a 23.5" Military using the 120gr Ballistic tip. Nosler list 3000fps for the load in their test barrel, 23" lija


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I did alot of testing and found the "best" powders to be RL 22, then both RL-19 and H414


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Originally Posted by baltz526
47gr of H4350 gives me 2850fps out of a 23.5" Military using the 120gr Ballistic tip.
Nosler list 3000fps for the load in their test barrel, 23" lija


I've noticed too many Xs that not only Nosler but others as well, lists higher velocities than WE are able to get with similar barrel lengths ? ? ? Old discussion - no need to re hash.

Thnx
Jerry


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How's your rifle throated ?

About 10-12 years ago I bought one like yours and a 140 SMK could be placed on top of a case (unseated) and the bolt could be closed.

Scary accurate though. It was my NRA center fire Hunter class silhouette rifle for awhile.

Good luck.


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I'm at 2950 with a 123 scenar and h4350. 4831 is too slow for 120's.

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Originally Posted by 284LUVR
How's your rifle throated ?

Good luck.


I can't remember off hand because I'm also working with a custom 284 W and I get them confused -- at times like this.

Just getting started w/120s I simply set COAL with the Factory ammo. I've had WW 140 PP that were very accurate so I'm using 3.150 for now.

I have checked distance to lands but simply don't remember right now.
I will play w/COAL but today I was getting an idea per vel/charge.

Thnx

Jerry


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Originally Posted by dogcatcher223
I'm at 2950 with a 123 scenar and h4350. 4831 is too slow for 120's.


I have thot IMR 4831 might be too slow burning. At 50 grs there is still room for more powder AND I'm not at max pressure. (refer to OP and Denton's post I copied)

I have IMR 4350 and will try it before buying the H version. Here our temp during season CAN get -Zero but not often. Most of the time our hunting season temps range from 60* down to @ 20* F. That's the reason I haven't chased the insensitive powders YET.

OTOH , Rl 22 has a reputation of large swings w/low temps. I have avoided it so far.

Thnx

Jerry


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Straight from Nosler.
43.5 grs. IMR4350, Prvi case, Remongton primers and 120 gr. BT gets me nickle sized groups from my Tikka T3 Hunter.
No chrono results, I'm looking for accuracy and consistency. I'll be trying out some Barnes and Hornady GMX tomorrow.
http://www.nosler.com/nosler-load-data/65x55-swedish-mauser/

Last edited by smarquez; 04/30/16.

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Smarquez-

As far as I'm concerned too -- HI vel is useless w/o accuracy. IF you get 3500 fps and can't hit a 'wash tub' you don't have anything.

From Denton's post in Reloading Forum
---------------------------------

Campfire Pet Loads -- 6.5X55

49.5 grains H4350 with a 120 grain Sierra bullet and 3.000" COL gives me a measured 59.4 KPSI and 3075 FPS out of a 24" barrel. I back that one down a grain just for luck. Should give you about 3025 and around 57 KPSI,

****which is a conservative load for a modern rifle.****
--------------------------------

49.5 ** H 4350 ** = @ 3075

SO 43.5 IMR 4350 gives you an idea of speed. I KNOW H and IMR 4350 aren't ===.. Sometimes H is faster burning, sometimes it's slower burning.

I am shooting for 2900-3000 w/120s. Pun intended.
It MUST be accurate. I'm not wasting my time and components in group shooting loads that are dragging their butts.

I'm going to find the vel. bracket>>>THEN work on accuracy.

Thanks

Jerry


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An ADDENDUM -

If I can't find accuracy within MY velocity bracket......
a rifle will float down the river. I am sincere about that.

EVERY time I have settled....I've regretted it.


Jerry


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I would take a look at R17 as well. I think many people expect more velocity from it so put the pedal to the metal.

But there is enough tested data to verify at least an additional 50 fps or so in the cartridges that it's a good match for.

Check out the loads for the .260 R it is at 2,912 fps. on the Alliant site. The loads shown for the 6.5 are for military actions. The 6.5 should easily equal or slightly surpass the .260 at the same pressure due to 5% more capacity.

From what I gather R17 is close to IMR 4350 in temperature sensitivity but not as consistent as the H version. Most of the high power shooters seem to be using H4350 for 120-139 gr. bullets in the .260. Usually about 42-43.5 grains.


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Jerry,

I have been playing with a 6.5x55 for quite some time and H4350 is the powder that gives me both velocity and accuracy with 120, 125 and 130 grain bullets....

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Originally Posted by jwall
Originally Posted by 284LUVR
How's your rifle throated ?

Good luck.


I can't remember off hand because I'm also working with a custom 284 W and I get them confused -- at times like this.

Just getting started w/120s I simply set COAL with the Factory ammo. I've had WW 140 PP that were very accurate so

>>>I'm using 3.150 for now.>>>

I have checked distance to lands but simply don't remember right now.

Thnx
Jerry


CORRECTION--- CORRECTION

The factory COAL is 2.940 NOT 3.150 sorry!
I said I was going from memory, so... blush

Today I set the COAL for 120 NBT at 3.000". These 120 NBTs are much slimmer nosed. The secant ogive is 'shallower', more streamlined.

Also I turned a 140 sp upside down and closed the bolt. The distance to lands is 2.715--base of bullet. This Win 70 is not xtra long throated. I'm glad. smile


Today I prepped cases and loaded IMR 4350 for testing. I am trying IMR because I have it before buying H.

Thnx
Jerry

Last edited by jwall; 05/02/16.

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Tejano & MMGravy

I have also considered Rl 17 and you are right about it being 'close' to 4350. As I posted just now earlier I already have IMR 4350 and if I'm not satisfied, I will check out Rl 17 and H 4350.

Thnx
Jerry


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I was hoping you would test some R17 so I don't have too.

I will get to it at some point as I don't want to leave any velocity on the table. But probably will stick with the tried and true H4350 for the lighter bullets.

First I need to run through the heavy bullets as I may stay with the 129-160 range before trying the 120s.


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Originally Posted by UKdave
I did alot of testing and found the "best" powders to be RL 22, then both RL-19 and H414


With the 120 NBT, I've found both IMR 7828, similar speed to RL22, and RL 19 to give me both good speeds and accuracy in my M70 Classic.

My M70 seems to like the slow powders for some reason.


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We have a couple of the M70 Classic rifles in the Swede around here and they both prefer the slower powders. They also seem to prefer the heavier bullets. That has not been a problem as we have found that less than 3000 fps will still kill a deer... smile

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