Accubond vs. Partition Ogive

[SamOlson]

How much closer to the lands can one get using a Partition Spitzer vs. AccuBond given both bullets(180 grain/.308) are seated to the same COL?
Thanks for any info , Sam

 

[JD338]

Sam,

Welcome to the forum.
Not sure I fully understand your question. The BT and AB bullets are longer than the PT's of the same weght.
The best way to measure is with a Stoney Point but you can also insert your bullet into a fired case (slightly deform the case mouth so it will hold the bullet secure) and carefully chamber the "dummy" round. By seating the bullet long, you will actually engage the bullet into the rifling and then the bullet will seat deeper into the case. Carefully remove the "dummy" from the chamber and take a OAL measurement. That measurement with that bullet is where it touches the lands. Back it off say .020" and set up your seating die to that length and you are there.
By doing this exercise with both the BT and PT bullets, you will have the answer I think you are looking for.

Hope this helps you out.

JD338

 

[SamOlson]

Thanks for the good answer JD338.
I actually ended up doing pretty much what you described.
I found that with identical COL's (the max my magazine will allow) I can get the Partition .070 closer to lands in my long throated rifle.

 

[JD338]

Loading close to the lands isn't everything.I load my 338RUM to max magazine length and get well under MOA accuracy.
What are you shooting?

JD338

 

[SamOlson]

JD338, it's a Sako 85 S/S in .300WSM. After having trouble getting consistent results with TSX's I loaded up some 180 Accubonds last night.

.7" at 100 yards during this mornings test. I am a happy camper.
Partition load work up is next.
Sam

 

[JD338]

Sam,

Good shooting!
but you missed the dime! :lol:

What powder and charge weight are you using?

JD338

 

[SamOlson]

I might have missed it with the .300 but I nailed it with my little CZ .17 HMR..........grin
At 60 yards BTW.

I am using 65 grains of H4350 along with a Federal 215 GM.
Velocity
2933fps
2922"
2922"

I am getting a much lower ES with the AccuBond than I did with the TSX.

 

[JD338]

Impressive Sam! :shock:
First time I've ever seen that. :lol:

Nice load for the 300WSM.

JD338

 

[SamOlson]

Thanks JD338, the CZ 452 is a great way to let the Sako cool down on these warm days.
A 180 grain bullet at 2925fps isn't the fastest .300WSM in the world but I'm tickled nonetheless.
PS. I don't think a Mulie will know the difference....grin