.510 whisper build and barrel length

[ST42]

Gents,
I'm in need of some Quick Load analysis on powder burn vs. Barrel length. I figure a 16" barrel will be more than long enough to burn up the powder on a .510 Whisper. I am wondering if you can give me a barrel length minimum to achieve 100% burn? If it helps, lets plan on 710 gr. Amax's. I am toying with a plan on building it as a pistol, ie. shorter barrel than 16" and the Form 1 it into a SBR.
Thank you,
ST42

 

[Mugsy9010]

Resurrecting this thread, wondering what barrel length you ended up going with and how it worked out.
TIA

 

[45-90]

I went with 25.75" on mine, for various reasons.

 

[chance553]

Im having a barrel made as well. It should be 16.5, mostly cause we could comfortably get two out of a blank

 

[45-90]

I special ordered a barrel blank, a 10 twist finished at 26", but trimmed a 1/4 off the muzzle to make sure the rifling was perfect on the muzzle end, before threading for the brake. Chambered and finished it in two days, it was a bit more involved than the average chambering, fitting tbe bolt to the reciever and extractor fitting.
A little modification needed to the MDT 338 Lapua mag, to get it to feed.
All done, with the rifle, busy making 100 rds of brass, now.

 

[chance553]

I special ordered a barrel blank, a 10 twist finished at 26", but trimmed a 1/4 off the muzzle to make sure the rifling was perfect on the muzzle end, before threading for the brake. Chambered and finished it in two days, it was a bit more involved than the average chambering, fitting tbe bolt to the reciever and extractor fitting.
A little modification needed to the MDT 338 Lapua mag, to get it to feed.
All done, with the rifle, busy making 100 rds of brass, now.

your brass looks great. what is your method for cutting the shoulder?

 

[45-90]

your brass looks great. what is your method for cutting the shoulder?

I have described the procedure with photos somewhere around this thread.
But I use a precision Hardinge Toolroom lathe with a mandrel, in a collet to turn the shoulder to its headspace length.
Just finished one hundred pcs.
Besides the usual 50 cal bullets, I thought this 350 gr bullet would make an interesting contribution, designed for handguns and expands at low velocity...So how fast will it go and how violent would expansion be at high velocity?
Will be testing a variety of powdes, soon.

 

[chance553]

That looks like a good way to do it. I need to spend some time with my lathe and get the tail stock nice and centered. The previous owner was not kind to it.

Ive had the same thought with those projectiles. They could be a lot of fun