300 wby - 150 grain partitions

[Blaze]

Has any one had any accuracy issues with the 150 grain partition 300 weatherby factory bullets?  I have several 300 weatherbys and none of them will shot the 150 grain partition bullets accurately.  I have had great experience with the 180 partitions and accubonds but the 150 grain partition bullets will not group well at all.  It almost looks like a scattered pattern and occasional flyer.  I grew up hunting and shooting a 300 win mag with 150 and 165 grain partitions with excellent results.  I am just curious if the increased speed and shorter bullet length may cause the bullet to be unstable in the 300 weatherby or if it is just a bullet that does not shoot well in any of my rifles.

[eford]

Every rifle can handle bullets with different accuracy and it is rare that a particular bullet weight and design does well across calibers or chamberings.  What's great in a 300 Win Mag might suck pond water in a 30-06 and so on.  Your rifle being more accurate with the 180 grain bullets compared to the 150s is nothing new and it is probably not anything you are doing wrong.

With the 180gn bullets being longer than the 150s, there is more surface area of the bullet in contact with the bore and the better accuracy with the heavier bullets is partially due to that. your 300 Wby might shoot the 165/168gn bullets better than the 150s, but still not as tight a group as the 180s. Range time will tell.

[terminator]

My 300 Wby shoots the 130 TTSX very accurately, so I dont really feel the higher speed and short bullet length is the problem.Some guns just like certain bullets and weights.

[Marishka]

My U.S. SS Mk V .300  is happy with everything from 110 grains to 250 grains.

[zonie]

I'm speaking in general terms,  there are some rifles and calibers that can shoot different bullet styles and grain weights to roughly the same point of impact with at least decent accuracy.   Other rifles can be finiky at best regardless of ammo tested this is the beauty of handloading.  Some people don't have the inclination, time, money, or need to handload and that's not a bad thing we all have different needs.  Partitions and I use a lot of them are not always the most accurate,    I'm splitting hairs here most of the time I'm happy with a consistant 1 inch 5 shot group with partitions as a whole,  some will shoot 3/4 "  no problem, where as the same rifle with known accuracy bullets will shoot 1/2 " groups.  The hunting accuracy difference isn't that huge.  The main reason partitions aren't considered match accuracy bullets is the design,  you are sticking a hunk of lead in one end and a piece of lead in the other with an H section in between.  This doesn't lend itself to a perfectly balanced bullet all things being equal.   Bearing surface, bullet boat tail or non boat tail,  bullet length,  velocity all can play parts in  accuracy.  Jacket thickness,   how precise the bullets are actually made,  bullet tip deformation can affect accuracy,  to what point and degree is dependent on the  rifle,  the loads, etc.  If you know your rifles don't like the 150's don't shoot them and stick with what works.  If you are hand loading you have options of fine tuning.  Personally   I really don't see a reason to use a 150 in a 300 wby,  your 180's even 165's are probably better for hunting anyway.  I don't think even Nosler custom ammo lists a 150 partition in the 300 wby where they list  150 accubond,  why I don't know they would load one but not the other,  probably not a big seller.    You are going to find guy's who use lighter than 150's in a 300 wby and  likelty 99 percent are handloaders.   Is it wrong for them to use these bullets ?  No,   they found something they like  that's what they use and more power to them for it.   What I don't understand is you have several 300 wby's and none shoot 150 partitions,  I don't get that one at all, unless you are expecting pinpoint accuracy across the board. 

[Ethan Allen]

Color me one of the slower students in the class.  For the past few months I have been reading everything I could find here about the types of ammunition I should buy for my "new" previously driven Mark V Deluxe 270 and my new Mark V Deluxe 300. 

I don't get a great deal of time to shoot all I want and I own a number of rifles I like to take to the range and hunt.  I plan on hunting the WBYs as my prime sitting rifles, but I own a fairly large tract of land that I also manage timber on.  It is really required that I bust through heavy brush on some hikes so I just couldn't put the fine new babies through that.

So after all my reading I had settled on what rounds and grains I thought I would begin with.

I stopped at Cabellas and the selection was slim.

After careful study I had made up my mind that 130 grain would be perfect for the 270.  I picked up a box and then made the mistake of looking at a 140 grain Accubond.  OK, I won't lie ---  the little white tip intrigued me. 

Then I went looking for a 180 grain .300 Magnum that so many contributors here seem to favor.  Once again the guy in the dunce cap started looking at the pretty green tip on the 165 grain nosler balistic tip. 

So I walked out of the store having bought the 140 grain Accubond for the 270 and the 165 grain nosler for the 300.

 Now I wondering just how stupid I was?  Somewhat stupid.  Very Stupid.  Extremely stupid.

Any advice?

[terminator]

Only one way to know.Try them out in your guns. Good luck.When does your season start?