300 Norma Improved shoulder angle?

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NormaMag

Guest
Hello

I`m planning building a 300 Norma imp for long range shooting and 1000 yard bench rest.
What is the best shoulder angle for best precision? Don't know if I should go for, 30,32.5, 35, 37.5 or 40 deg.
I know Tom Sarvers 300 Hulk is 33 deg shoulder and extreme accurate.
 
I think you're hard pressed to say one angle between 30 and 40 is the best (and I'd suggest there isn't any difference within that range). If a lot of guys in 1,000 are shooting the Norma Improved, I go with the most common angle. It'll allow you to share data.

-Lee
www.singleactions.com
 
33-35 degrees, no more, no less IMO

It's not about "precision" it's about maintenance. 40* Ackley's SUUCKKK! in this regard

al
 
IME with a case as large as the Norma, or more specifically with a shoulder as long as the Norma case (neck diameter VS shoulder diameter) the 40* shoulders will bounce on resizing. You end up shoving the shoulder/body junction back too far while trying to gain clearance at the neck/shoulder junction

I have found 35* shoulders to offer good resistance against sliding while not exhibiting the bouncing problem. I've found bounce cases like 22-250AI, .243AI etc.

On the other hand I've had no problem with the 30-06AI in 40* because the shoulder is short enough to offer good support.

opinionsby






al
 
On the other hand I've had no problem with the 30-06AI in 40* because the shoulder is short enough to offer good support.

opinionsby

Interesting. I have both 6.5x55 AI and 30-06 AI without any problems. I also just ordered a 300 Blaser imp with 37.5 degree shoulder reamer.It`s basically a 300 Dakota with a bit longer neck and 37.5* shoulder. Hope I wount get problems resizing that as I will use it in long range BR competitions :/
 
NormaMag said:
No newer. Only around 20. What do you think about the 37.5 degree Blaser? Problem with sizing?
Click to expand...

I settled on 30 as max for the shoulder angle. It's what I used on the Yogi and BooBoo series of rounds after many years chambering and shooting Ack Imp rounds. Never had any complaints and brass lasted indefinitely. After 30 what is there to gain?
 
308 Baer Cub, it's a proven winner at Williamsport. Call Bruce Baer for deets.
7173494077
 
Dave Tooley said:
I settled on 30 as max for the shoulder angle. It's what I used on the Yogi and BooBoo series of rounds after many years chambering and shooting Ack Imp rounds. Never had any complaints and brass lasted indefinitely. After 30 what is there to gain?
Click to expand...

Not much I guess Dave.
My die set is already finished, and reamer is ordered, so its too late changing it now :/
Hope 37.5 will work ok with pretty good brass life.If not, I need to find another solution.
 
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