280 AI & 150g ABLR

[Ridgerunner665]

Here are the SAAMI specs...

http://www.saami.org/pubresources/cc_dr ... proved.pdf

Compare them to the reamer used on your rifle.

 

[bboswell]

Got Ya.

Per the QL above I should get near 3050 which is only 5 off of the max Nosler lists for this powder anyway, I'm great with that if they will cluster into a tight little group.

Thanks for the help


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[Ridgerunner665]

When you get up near 3,000 fps start checking and measuring everything...

You may not quite make it to 3,050 fps, what I meant was, that is the MOST you will get within SAAMI pressure limits.

And my experience with the 280 Ackley has shown me that you cannot "see" pressure on this round until you're up near 70,000 psi....so when you do see pressure signs (ejector marks), back it down...way down.

Otherwise you'll just be killing primer pockets...and 280 Ackley brass ain't cheap!

 

[bboswell]

When you get up near 3,000 fps start checking and measuring everything...

You may not quite make it to 3,050 fps, what I meant was, that is the MOST you will get within SAAMI pressure limits.

And my experience with the 280 Ackley has shown me that you cannot "see" pressure on this round until you're up near 70,000 psi....so when you do see pressure signs (ejector marks), back it down...way down.

Otherwise you'll just be killing primer pockets...and 280 Ackley brass ain't cheap!

I understood what you meant by "most".

Thanks for your help!


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[BuddyT]

I would like to see a poll taken on SAAMI spec 280 AI chamber, for water capacity. I have 2 280 AI's and neither has the case capacity that you claim. Case capacity measure by the direction given in the quickload instructions. Which says on page 64, "Eliminate any air bubbles and bring water even to end of case neck." My capacity for both rifle average in the mid to upper level of 71 grains. Measure with the meniscus bubble out of the top yields 72.5 average for both rifles. This is with once fired Nolser brass and fireformed Remington Brass. I'm aware that Quickload default to 74 grains, and I'm not sure were they got that info. I know that when I measure a fired case at the .375" datum line my measurement is 2.137" which is in the SAAMI specs.

 

[bboswell]

I am learning that this is not an exact science.

I measured 6 cases from a friends rifle and remeasured 5 of the cases I measured from my rifle and came up with 73+ for both.

What I am sure of us that Nosler's load data for this powder and bullet is way off and dangerous.

This pressure issue did not show up in test of H-4831 to max


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[nvbroncrider]

Bos,

I'm thinking your lot of powder might be a touch on the fast side. Just back it down a touch if accuracy holds then run it. Use the Chrony as a guide.

Jake

 

[bboswell]

Just got my latest edition Sierra loading manual. The differences between it and Nosler's data is astonishing


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[Ridgerunner665]

Sierra's load data has always been pretty watered down.

Hodgden is getting that way too.

Even the Nosler data stops well below max psi...its a SAAMI thing, stopping about 10-15% of max pressure....to allow for variables in the powder burn rate.

 

[bboswell]

Borrowed a Magneto-speed today. My chrono was 20fps faster @ 10' vs Magneto-speed @ muzzle


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