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Maybe the rifle got barrelled with a barrel intended for an Indian Mk III .308 interesting, that said the chamber must have be bored to take the .303 cartridge. They suggest groove diameter for .303...

I'm not Jeff. Something that might help. I had a Mk III .303, I bought a Lyman 311413 G/C mold, and found when I loaded it with the recommend
Unique load and tested it out, the bullet key-holed...

You most likely have a good point. I take the view that it’s not bullet diameter but rather bullet energy. How much energy does it take to effectively disrupt an animals life function. For deer I...

You most likely have a good point. I take the view that it’s not bullet diameter but rather bullet energy. How much energy does it take to effectively disrupt an animals life function. For deer I...

I took a buck with my P1914, .303 British. I used a hard cast 205 grain gas-check bullet from a Lyman .314299 mold, running about 2,000 fps. From past experience hunting chucks in my youth. I...

Good question. I load for a break action Cape Gun the barrel is heavy the chamber wall close to 1/2" thick. Most loads designed with a pistol cartridge in mind seem rather light. I've been shooting a...

Yes, I believe you are right about the 40 % of the BP charge that is most likely where I came up with my 30 grain Nitro charge for my 43 Mauser, but I have heard of them being charged up to 34 or 35...

12th Ed CARTRIDGES OF THE WORLD

387 LEAD IMR 4189 32 GRS 1,360 FPS

387 LEAD IMR 3031 40 GRS, 1,310 FPS


I shoot a 43 Mauser a bit smaller in...

The Red dippers I believe came first they are measure in cubic inches. When the yellow came out they were measured in cubic centimeters. In the yellow dippers the value under the "1" reflects the...

I drilled a short piece of 2x4 with holes to hold the 303 brass, then ran the exposed rim surfaces across the circular sanding disc on my belt sander, until the rims were thin enough to chamber.
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It is sometime useful to know the model of the .303 British you have and if it may have been rebarreled at some point. The later models tend to have truer barrel specs. In the older models the...

You are using AA#7 and not RL-7? What do you use as a starter load? I'm working with a 43 Mauser and I was thinking of using AA#7, but I can't seem to find any available data for a large bore rifle...

Those 43 calibers do have quite a bit of variation in groove diameter. I have a 43 Mauser model 71/84, its groove diameter runs to .446. The initial single shot carbine of the same caliber runs to...

You might have just hit upon the right barrel vibration harmonics. Your hunting bullet leaving the muzzle at a higher velocity does so at the bottom of the barrel's vibrations, its arc is lower,...

Is the Marlin 336 an older model with the Ballard rifling or a newer one with the micro-grooving. I have both and size the bullets for the older one to .308, the chamber throat being extremely tight....