35 whelen VS 35 whelen imp.

[1899]

Custom barrel and chamber. Loaded with 4831 to drive 140's at 2800fps. Case stretching is often blamed on case design when it is really due to some other factor. My P14 in 303 does not stretch cases at all. The Lee Enfields do. I had one 700 in the shop which stretched cases badly (it was a 6mm Remington which had been re-barreled by Shilen). It turned out the problem was a bolt face which was not square. After truing up the bolt face and setting the barrel back to correct the resultant headspace, the problem was gone and cases no longer stretched.
Another common cause is a chamber which is a little on the large side. The shooter partial sizes the cases and, as the die squeezes the body slightly, the shoulder bulges forward. A couple of firings and sizings like this and the case goes in tight. Regards, Bill.;

These are the kinds of posts that make CGN good.

 

[Gatehouse]

These are the kinds of posts that make CGN good.

x2!!

 

[Soledadsworld]

The "Ackley Improved" chambers are sometimes not so great a gain in ballistics, but in some cases, the redesigned case gives other benefits that are not always considered. For example, the 6.5x55. The velocity gain is there, but nothing spectacular. However, Brass life is improved dramatically, and you can neck size a 6.5x55AI case 10 times and it will still chamber easily, whereas the standard case needs a FL sizing every 3-4 firings to be able to chamber it easily, even with rather modest loads. The 22-250 & 220 Swift are 2 others that benefit case life when AI'd. Cases with less taper to start with are benefitted less in this respect. Regards, Eagleye

Great point.

I rechambered an Encore barrel to .35 Whelen AI after watching several videos from 358Outdoors on YouTube. Single shot break-open action frames will stretch over time from high-power loads. I converted to AI to reduce chamber pressure and reduce case neck trimming and extend brass life. I run regular .35 Whelen loads through it when I reload - not about velocity.

 

[SuperCub]

I converted to AI to reduce chamber pressure and reduce case neck trimming and extend brass life.

A 0.002" shoulder bump on brass will reduce stretching and trimming as well.

Most folks don't shoot the med bores enough to make the reduction in case trimming a huge AI bonus.

 

[9.3mauser]

Y'all realize this is an 18 yr old thread?

 

[CranePete]

And still an interesting read, I’d suggest.

 

[Licensed to kill]

Y'all realize this is an 18 yr old thread?

And??????