450/400 Nitro Express 0.410" & 0.411" Projectiles

[Aussie_Hunter]

Who has the answer on this one for me, I've done a bit of searching and can't seem to find a clear answer.

0.410" & 0.411" projectiles for the 450/400 Nitro Express. Could I use the 0.411" projectiles in a modern Verney Carron double? I believe the Verney double was regulated with the Hornady 0.410" ammo.

Also if the 0.411" projectile is safe to use in the rifle, do you think it would change the accuracy of the rifle since it was regulated with the 0.410" projectile?

 

[alby]

Maybe slug the bore?

 

[V.Veritas]

I used 0.411" 300gr Hornady soft point (made for 405 Win) in a 0.410" bore regulated for 400gr Hornady bullets. It works fine, for practice, but the regulation and the open sights adjustment is out the window, of course.
If you have a QD scope on the VC, set the scope for one barrel, use it as a single shot rifle for light game at longer range. It works fine. Test where the 2nd barrel hits and know the difference.

 

[Schüler Jumbo]

The CIP grove diameter is .410 for the .450/400 NE 3”. Therefore, shooting .411 in your double could stress barrel joining especially with monolithic solids.

 

[Bandera]

I did some reading in this. I want to shoot a soft point .411 out of my Ruger No.1.
From reading on the Internet, I do not remember which bullet maker said what, I do not feel like scrolling through pages again, so here goes.
One of the bullet makers advises against doing this as it would be unsafe.
A different maker said the .001 will not make a difference.
There people who have loaded the .411 in a double with no issues.
There are people advise against it.

Basically the advice is split.
If I was going to do this I would pick a powder similar to Trail Boss or 5744 and work from there.

I popped into the reloading area to ask our fellow AH members about this topic.

 

[Schüler Jumbo]

I did some reading in this. I want to shoot a soft point .411 out of my Ruger No.1.

I would not expect a stress/strain problem with your No.1 because it is a single barrel. Joined double barrels are subject to barrel joint stressing.

 

[V.Veritas]

The CIP grove diameter is .410 for the .450/400 NE 3”. Therefore, shooting .411 in your double could stress barrel joining especially with monolithic solids.

This is solid advice.
Woodleight makes the solid (FMJ) only in 0.410" diamter for both barrels - 0.410" AND 0.411".
There is no 0.411" solid for a reason. I would not try a monolithic 0.411" bullet in a 0.410" barrel.
Hornady 300gr 0.411" is a cup and core soft bullet. Using it there is no problem.
@Bandera is correct - I'm using Accurate 5744 reduced loads to get within the speed enevlope of the original Win 405. (I've pushed them too fast and then I backed down for better results).

I have personally verified all the above with Ed Hammond.

I'll include the link below for various 0.400" reduced loads.

Reduced Recoil Loading Data for the .400-.416 Big Bores

 

[1dirthawker]

cup and core bullets, i suspect you could use .411 bullets but why? the guns bore is very likely .410 and was likely regulated for such a bullet so why use one that is overbore?

i suspect mono metal bullets would likely stress the barrels on the gun if they were .411. the cup and core bullet would compress/conform to the .410 bore and be less likely to hurt anything but @V.Veritas has it right.