[Afy]

It has been done for large calibers,,, think upwards of 100mm... much like the APDSFS has been adopted to smaller calbiers.

The question is... does anyone produce a base bleed bullet for say a 300 win mag.. or are gas checked lead bullets supposed to mimic the functionality?

Merci beaucoup...

[Zak Smith]

The closest you'll probably find is tracer, whose BC is increased slightly by the base bleed.

[Afy]

Zak with the uttomost respect... most traceer is nose coated. At least in rifle ammo as far as my expereince has been. Which to say the least is limited.

The BC for accuracy must be lower, per what I have learnt from your writing. In the lager caibers that is exactly what BB is supposed to do. So if you lower the BC accuracy will drop off and be counter productive...

[Zak Smith]

most traceer is nose coated.
No. Rifle tracer bullets have the tracing compound in their bases. Many of them are painted a color on their tip for identification purposes (orange/red).

references:
http://en.wikipedia.org/wiki/Tracer_ammunition
http://en.allexperts.com/e/t/tr/tracer_ammunition.htm
http://www.chemistrydaily.com/chemistry/Tracer_ammunition
http://www.hi-vel.com/Catalog__18/Tracer_Ammunition/tracer_ammunition.html

I don't know what you are trying to say in your second paragraph.

[SDC]

There's no reason it COULDN'T be done in small arms calibres, but you'd be giving up so much weight in the form of a "non-tracer trace cavity", that I think you'd probably be better off going to an extreme form of boattail projectile to make it as aerodynamically efficient as possible. (Think of a VLD with the same ogive at both ends of the bullet.)

[Jim Watson]

(Think of a VLD with the same ogive at both ends of the bullet.)

Greener described the Krinka-Hebler bullet like that in 1910. It was completely torpedo shaped with no cylindrical bearing surface. It also had a hole running full length from nose to tail to bleed air into the base vacuum. Saboted in the cartridge and barrel, of course. Greener said it had an extremely long range but was very inaccurate; perhaps usable for long range machine gun barrage.

[SDC]

I have to wonder if the Krnka design was ever really stabilized in the bore, or if it even had enough of a bearing surface to fully engage the rifling; maybe a base cup that fit over the rear ogive, then separated once it was clear of the muzzle would give better results?

[Jim Watson]

That was what the Krinka sabot amounted to. A discarding cup that sealed the bore and gave some bearing surface.

They claimed an effective range of 4402 metres (4810 yards) with a velocity of 347 mps (above 1100 fps) and penetration of 27 cm (11 inches) of wood. Maximum range was said to be 8850 yards. The US M1 173 gr boattail had a tested maximum range of 5400 yards. That was considered important in those days when long range machine gun barrages were tactical doctrine.