450-400 3.25" bullet diameter?

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15 February 2020, 18:24

bwanamrm

450-400 3.25" bullet diameter?

I understand this may be different in certain rifles... what is the original Kynoch ammo bullet diameter and did different British makers also offer their own ammunition to go in rifles so chambered to fit the slight changes in bullet diameter?

I have seen Westley Richards proprietary loadings for the caliber and Kynoch, any other houses load for it?

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15 February 2020, 21:25

cal pappas

On the 3 1/4" case I have pesonally seen diameters form .408 to .410. I have heard as small as .406.
Cal

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15 February 2020, 22:58

470Evans

I have a box of original Kynoch 450/400 3.25 but don't want to pull one apart to measure. I suspect somewhere that info is on a forum.

On my Webley built William Evans 450/400 3.25 from the 1920s the bores measured .408.

15 February 2020, 22:58

dpcd

They used some tapered bullets way back as well, to keep pressure down so only the heel might be at full groove diameter.

16 February 2020, 06:29

Dutch44

I have slugged the 6 that I have or currently own. The BPE Rigbys are .408 and my Nitro run .410 on average with one barrel .411 on an early A&N while the other barrel was .410.

16 February 2020, 19:45

My 1909 Greener is a .408.

16 February 2020, 20:48

husky

My 1922 Webley & Scott is also a .408".

Got Original Soft Point Kynoch ammunition from the 1960.s and they are also .408"

19 February 2020, 06:31

Omnivorous_Bob

quote:
They used some tapered bullets way back as well, to keep pressure down so only the heel might be at full groove diameter.

I had a few boxes of old Kynoch 3"years ago. Shot most up chronoing it (1950-2025fps but barrels grouped well, topic for another time) and pulled, measured, weighed, and reloaded a few. Most were .4105" and that only at the base.

Complete speculation on my part but that probably would be a good way to compensate for varying bore diameters amongst rifle makers and also likely kept pressure down, especially with solids. Those guys were really, really, good at what they did!

Bob

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