.300 Win. Magnum and Remington Core-Lokt bullets.

[jphendren]

I have been unable to find any load data for the .308", 180gr Remington Core-Lokt bullets.  Somebody suggested on another forum that I can use data for another similar jacketed 180gr bullet to get me a starting charge and work up from there.

I have had a new 4 pound jug of Win 760 in my garage for about 2-3 years and found a load published by Barnes for their 180gr XFB and XBT bullets using Win 760.

Win 760  62.0 2,739 - 67.0 2,960 using a Fed GM 210M primer.

Would it be safe to use the starting charge for this bullet with the 180gr Remington Core-Lokt bullet?  I realize that there are better powders for this caliber, but I would like to use up some of that Win 760 since I already have it.

Jared

[BBF]

You are correct, this powder is not used much for the cartridge.
The best I can came up with is :

Speer Loading Book # 13
Page318
For all of their 180 gr bullets
 61.0 gr minimum to 65.0 gr Maximum

WW cases. CCI 250 Primers
Firearm: Ruger 77 Mk II

Rem CorLokt's shape resemble Speer's  Mag Tip and Grand Slams very closely. The COL given for those two are 3.285"

[demented]

 Sorry to nose in here but my concern is how fast can a Cor-Lokt bullets be pushed before suffering jacket separation?  I'm working on some 7mm R Mag loads with a 150 gr and am afraid I'm going to have problems up close.

[Dand]

JP  straight from the 2010 Hodgdon powder website (they make/sell Win powders now).
http://www.hodgdon.com/basic-manual-inquiry.html

300 Win Mag:
180 GR. SPR MT-SP    Winchester    760    .308"    3.285"    58.0    2722    48,200 CUP    62.0    2845    52,300 CUP



The bullet in this case is the Speer Mag Tip.  I don't think its enough different from the Rem CorLokt to worry about at the starting loads. Both are standard cup and core bullets. The mag tip might have a little bit harder lead in it. I'd say your Barnes data is a little bit hot to start with compared to this data. And Barnes X bullets are much harder - less comparable to the Speer.

Like Scatter says, 760 is probably not the prime powder for the 300 win mag.  My old Winchester Western Ball POwder Load manual dated 1978 does not list 760 for the 300 win mag.  Slower powders like IMR 4831, H4831, H450, H1000, Reloader 19 and 22, 25 are probably better. If 760 is all ya got, it will work.

Even with Hodgdon, 760 is the last recommended powder for 180 gr bullets in 300 win mag.

Demented: The cor-lokt is one of the better cup & core bullets for holding together but at very close range and full power 7mm mag loads I think you better expect pretty explosive performance. I'd prefer a more premium bullet like the bonded jackets, partitions or X bullets.  Or if you will only shoot at close range, don't load to full power. Load a 7x57 or 280 equivalent velocities.

[Grumulkin]

I have been unable to find any load data for the .308", 180gr Remington Core-Lokt bullets.  Somebody suggested on another forum that I can use data for another similar jacketed 180gr bullet to get me a starting charge and work up from there.

I have had a new 4 pound jug of Win 760 in my garage for about 2-3 years and found a load published by Barnes for their 180gr XFB and XBT bullets using Win 760.

Win 760  62.0 2,739 - 67.0 2,960 using a Fed GM 210M primer.

Would it be safe to use the starting charge for this bullet with the 180gr Remington Core-Lokt bullet?  I realize that there are better powders for this caliber, but I would like to use up some of that Win 760 since I already have it.

Jared

1.  I think the 180 gr. Remington Core-Lokts will work just fine on paper and on game.

2.  I frequently use starting loads from different bullet manufactures for bullets of the same weight of other manufacturers and have never had a problem.  I do, however, have multiple reloading manuals and compare data before deciding on my starting load.

3.  Winchester 760 also known as H414 is probably not the best powder for what you want to do but if I had a bunch laying around, I'd probably try it.  It may do very well.

[Lloyd Smale]

if anything ive found that barnes bullets usually give you high pressure sooner then a conventional cup core bullet like a corelock. Especially considering that the corelock is not a boat tail bullet and takes up a bit less powder space.

[jphendren]

"3.  Winchester 760 also known as H414 is probably not the best powder for what you want to do but if I had a bunch laying around, I'd probably try it.  It may do very well."

After looking through several load manuals and the internet, I did indeed find several .300 Win. Magnum loads using W760.  I did notice that with that powder, the .300 can barely outperform a .30-'06 with the same bullet.  So, I think that I will stick with something more along the lines of IMR 4350, 4831, or 7828.  I believe that Win 760 is just too fast to achieve my goal of somewhere around 2,900-3,000 fps with a 180gr bullet.  I have a little of each powder mentioned above out in the garage; I've always been partial to 4350 as that is what I use in my .375 H&H.  Out of those three, anybody have an opinion on which is best suited to the .300 Winchester Magnum?

Jared

[shot1]

Sorry to nose in here but my concern is how fast can a Cor-Lokt bullets be pushed before suffering jacket separation?  I'm working on some 7mm R Mag loads with a 150 gr and am afraid I'm going to have problems up close.

That is the problem with any cup and core bullet and a mag caliber rifle. On the other hand the Core-lokt bullet is a pretty good bullet for holding together. It all depends on what you are going to shoot with it. If it is deer size game it will not matter if it does come apart. It will not blow up like a varmint bullet on the hide but after it gets inside the vital area that is what you really want. If it is game like elk size stuff I personally would want either a 160 gr  Nosler partition of accubond bullet.
I have shot quite a few deer with a 7mm mag and my experience has been that it don't really matter what bullet you use if they are inside 200 yards even with a perfect heart/lung shot they are going to run off 50 to 100 yards before they go down. The best bullet that I found for deer is the 154 Hornady SP interlock.  They don't run as far on it. Over 200 yards the bullet has slowed down enough that it kills much better. I know people that have had the same problem that I found and now load their 7 mag down to around 280 rem velocity and they get much better results at closer ranges. After my stint with having to track deer through the cut overs of NC for 3 years I finally got rid of the 7 mag and went to a 25-06 mostly. 99.9% of the time NO TRACKING needed.

[BBF]

If I had to hunt with a 7mmRem in close range situations I would go to a heavier bullet then 150 gr and perhaps load it down some.

[Dand]

JP - my long time preference in my 300 win is for IMR 4831. I have had excellent results with it. Very accurate with a variety of 180 gr bullets. I don't load it quite to max and get about 2950 to 3000 fps on my chrono, 24 in barrel.  My chamber throat is long so my OAL cartridge length is longer than standard. My brass lasts a long time with the loads - well over 5 loadings.

I use mainly Rem brass and CCI mag rifle or  Fed 215 primers. Speer Hot Core, Rem Cor-lokt for practice, even Win Power Point. But mainly hunt with Nosler Partitions - shoot same as Speers in my gun. 1" to 1.5" at 100 for 3 or 5 shot groups and I've shot a few 1.5 in groups at about 200 yards.

Again refer to the Hodgdon data site for IMR loads as they sell that brand of powder now too.
I have gotten great accuracy from Alliant Reloader 22 but my loads are light as I work up and I haven't chrono'd any yet. Going for accuracy right now. 

Good luck.

[Grumulkin]

After looking through several load manuals and the internet, I did indeed find several .300 Win. Magnum loads using W760.  I did notice that with that powder, the .300 can barely outperform a .30-'06 with the same bullet.  So, I think that I will stick with something more along the lines of IMR 4350, 4831, or 7828.  I believe that Win 760 is just too fast to achieve my goal of somewhere around 2,900-3,000 fps with a 180gr bullet.  I have a little of each powder mentioned above out in the garage; I've always been partial to 4350 as that is what I use in my .375 H&H.  Out of those three, anybody have an opinion on which is best suited to the .300 Winchester Magnum?

Jared

The first one I'd try would probably be IMR 7828 followed by IMR 4831.

[tony212]

I use Remington Corlokt 165 grain bullets in MY .300 Win Mag all the time.   I use IMR 4350, WLRM primers and Winchester cases.  I'm at work and can't check by notes so I'm not sure how much powder I use.
Tony212

[Lloyd Smale]

my favorite powder for the 300 win mag is re19 followed closely by re22, 4831sc, and 7828sc