Noslers harder jackets??

[Anonymous]

Hey fellas,
Something keeps my interest about the Partition but it's the only bullet that gives me trouble to get accuracy from.

I suspecting the harder jackets prevent the rifling to do it job. Any advice as of something i might be missing. I don't have ANY trouble getting great accuracy from Sierra or Hornady or Win or Rem bullets without breathing hard. Any powder i use I get great accuracy from the cup and core.

 

[DrMike]

I would be more inclined to question the complexity of the design rather than the jacket material. Having said that, it is interesting to me that Partitions shoot far better in a number of my rifles when compared to AccuBonds. Again, I suspect design, as boattails introduce complex angles that require greater care when seating the bullet.

 

[Ridgerunner665]

I've noticed that Noslers foul more in my 30-06 than any other bullet I've tried...they're accurate, but they leave gilding metal on the lands...but so does most factory ammo (Rem, Win, Fed)

That doesn't happen with Bergers...Bergers shoot clean as a whistle...I though J4 jackets were pure copper, which supposedly fouls more?

 

[Ridgerunner665]

Mike...you may already know this...or I may even be all wrong (its just an ole hillbilly's theory)

Bullet bases affect the "release" at the crown more so than anything...with a boattail, the bullet often has to go through the ejected gasses at the moment of release, the gasses blow by the bullet before it actually clears the barrel, the boattail is still "in" the barrel...this can and does effect accuracy, because it makes the barrel crown even more important.

Flat base bullets don't have that problem....and they often seal the bore better (rifling and its consistency come into play here to a degree IMO)

As to the OP's question...the first thing I'd try is adjusting the seating depth.

 

[DrMike]

Mike,

Bullet bases affect the "release" at the crown more so than anything...with a boattail, the bullet often has to go through the ejected gasses at the moment of release, the gasses blow by the bullet before it actually clears the barrel, the boattail is still "in" the barrel...this can and does effect accuracy, because it makes the barrel crown even more important.

Flat base bullets don't have that problem....and they often seal the bore better (rifling and its consistency come into play here to a degree IMO).

Yup.

 

[Ridgerunner665]

LOL...I edited my post a bit...thought you probably knew that already :wink:

 

[Ridgerunner665]

Another theory of mine...this has no founding whatsoever other than being the only logical reason for it that I can come up with.


The above is also why most hunting bullets use a boattail that is actually too short to be optimum...bullet designers are attempting to "split the difference" between flat base and boattail.

 

[JD338]

oneshot

Welcome to the forum.
I have never had too much trouble getting the PT to shoot in several calibers and bullet weights.
You might want to play around with the COL to find the sweet spot.
Here is a 4 shot group I shot a few years back with 338 250 gr PT seconds.

JD338

 

[Anonymous]

problem is you only get 50 per box... and it's easy to go through them without good accuracy.

Although this year I will be hunting thick brush and the accuracy I got will suffice.

 

[Bruce Mc]

oneshot, thats why I buy them from SPS by the hundreds. I worked up a load with 175 partitions for my 7mm rem mag and it took a lot of tinkering with oal to get it right. But they still don't shoot as good in my rifle as the 160 AccuBond.

 

[Anonymous]

who's SPS?

 

[Bruce Mc]

Nosler's Shooter's Pro Shop

 

[Anonymous]

got it... just googled it, thanks. they only have the 150's .30 cal.. guess they will do.

 

[Guy Miner]

Harder jackets?

Dunno about that. The front part expands Very Quickly.

They're not match bullets - but superb hunting bullets with a long standing, excellent reputation. Current Partitions seem to shoot very accurately. In the past, I had trouble getting them to shoot as accurately as more conventional bullets. But that was back in the 1970's.

Generally I can get Partitions to shoot MOA or so - good enough for most hunting. Used them on elk, deer, hogs...

If you want a bullet that may have more accuracy potential, yet deliver roughly the same performance on game as the Partition, give the AccuBond a try.

Regards, Guy

 

[Anonymous]

I got 2 inches at 100 yards with 180 PT 38 grains of IMR 4895 .308 winchester out of a Remington 760.

 

[Guy Miner]

OK - well, might be a lot of explanations for that - and by the way, I've killed game with a 2 MOA rifle, just fine.

I don't know that Partitions have a "harder" jacket. They're not marketed as a match grade bullet, just a mighty fine hunting bullet - which they've always been, and remain.

Love the .308, but I typically use a 165/168 gr bullet from it. The 165 Partition really does impress me with sub MOA accuracy from my .308 though.

From my beat-up old .30-06, about 1.5 MOA is what I see with the 180 Partitions. It doesn't do a lot better with much of anything.

Regards, Guy

 

[Anonymous]

PT's normally run at higher pressures than standard cup and core bullets.

JD338

what other reason would cause this other than harder jackets? I've read in a few load manuals the the harder jackets cause higher pressures. I know as the charge increases and different primers and case volume, and bullet seating, tempterture....

 

[Oldtrader3]

The Partiton acts as a beam in compression during transition through the rifle throat into the rifling. The Partition being located precisely at the tangent point for the Ogive into the shank raises pressure for pusing the bullet through this transition. Partition do not have a harder jacket. It is the phenomena that I just explained which may also cause more fouling particularly at the barrel throat transition.

I use Partition in seven different rifles and they are very accurate, particularly if you weigh and sort into 0.3 grain groups, grouped around mean weight, before bullet seating.

 

[Anonymous]

The Partiton acts as a beam in compression during transition through the rifle throat into the rifling. The Partition being located precisely at the tangent point for the Ogive into the shank raises pressure for pusing the bullet through this transition

Can this be explained more simply?

 

[Oldtrader3]

A regular bullet is like two pieces of copper sheet with lead between them. You squeeze it into a barrel and it takes little pressure to do so. The Partition is like trying to push an H beam of jacket metal into the barrel. It is much harder to do and takes more pressure. This is about as simple as I can get, hope it helps.