doublegunshop.com - home Forums General Discussion Double Rifles, Paradox Guns & Gauge Rifles @ doublegunshop.com .577 BP. Qest to Marakkai and the other owners

Well, anyway IMR or something else will be second step. Now I loaded 560 gr lead over 160 gr BP for barrels regulating, but first of all I have to mesure velocity

Don't they just look marvellous!

C'mon man, don't keep us in suspense! How fast did they go?

Well, I have shot all these 8 rounds today. Recoil is pretty sensitive, but can't say deadly, it's o'key for me. The sound is something!
I can't say about velocity right now, didn't measure yet, but something go wrong. I spent 5 rounds for barrels "proof" and for recoil test and only 3 rounds for target shooting. 2 rounds from the right barrel - 1/2 yard between holes at 50 yards, all 3 rounds from both barrels are in aprx. 1 yard circle! Badluck!
I have to check all stuff and next time I'm going to shoot 8-10 rounds.

Geno:
The grease cookie, or alternative bullet-lube/fouling-softening set-up within the cartridge, is critical in loading BP cartridges for accuracy. If you haven't researched this, Mathews has produced a number of inexpensive booklets on the topic, and Graeme Wright's chapter on loading BP Express cartridges gives a few hints. Without lube in there somewhere, you will be unlikely to fire 10 shots without loosing accuracy, perhaps by a 1/2-yard (!), because the hard crusted fouling from the first few shots damages the lead bullet on subsequent shots. All brands of modern black powder are significantly less moist-burning than originals like Curtis & Harvey etc.

If you already know this, please disregard. Also, others have found that using a drop-tube to introduce black powder into the case reduces accuracy for some reason, but not by half a yard. I think that was reported by Sherman Bell, finding out for himself once again.

Hope your next range session sorts out the problems.

Finnally!
I made this THING to shoot well!
560 gr solid bulet in paper patch over greese cookie and over 165 gr of BP "White Bear" #3 (FFFg) was too tough for it. Left bbl shot to the left and right - to the right, distance between POI's was abot 8" at 50 meters.
Next reloading and 520 gr HP bulet, paper patched, greese cookie, 158 gr of BP and you can see two control shots at the target (sorry, for the target, got no time to print something more good-looking).
I think this HP bullet and 160 gr of BP will be what I expected.
Next step is testing in wild.
Will be continiued