Browning 1885 BPCR

[Rbertalotto]

I looked everywhere at BACO and can't find JIM459520M1. Is it possible it is discontinued?

Is there a comparable grease groove version?

[Don McDowell]

That is the grease groove number.

[Old Jim]

Bullet mold # JM459520M1 is found on page 7 of the BACO .45 caliber grease groove bullets. If it is out of stock, BACO replaces these popular items as they become available.

And you're welcome,

Jim

[Martini2]

One thing that may be overlooked is the rate of twist of different rifles. The Sharps replica by that maker is known for 1:18 twist barrels. What is the twist in the Browning ? If it's say 1:20 it, in combination with your mild loads, can cause instability. The rifling twist and velocity must spin the bullets of choice so that they "go steady on axis". shorter bullets are satisfied with slower twist. But 500+ grain bullets are longer and require more spin or more speed in slow twist to approach stability. It's just the laws of physics.

[Don McDowell]

The Browning BPCR's are 18 twist Badger barrels.

[Robert L]

The Browning BPCR's are 18 twist Badger barrels.

Yes...checked that. 18" twist.

Pedersoli is also 1 in 18" twist.

I have a verity of loads worked up. I'll get to range next week and print them on paper. Due to the storms that came through yesterday, I have a lot of cleanup to do and the range is hosting matches this week end so I can't do any load testing there. I will post results.

[Martini2]

Robert L as it's said "the proof is in the shooting". Only thing I might add is if you have access to a chronograph. One truism about BPCR shooting is that different barrels can produce differing results. The chamber throats and rifling lead can vary also. One of my nemesis 45-70s had a chamber to bore transition that was so short any bullet passing through it got off to a rough start. Hopefully that is no where near the case in your rifle. Your already seating the bullets to touch the lands and that is good. Good luck at your next outing please keep group up on results. As far as I've experienced the learning curve may change in angle but there is no upper limit.

[Robert L]

The Browning throat is short compared to the Pedersoli. I had to increase the compression in order to seat the bullet deep enough to chamber, just touching the rifling.

Also, the Browning measures .460 groove diameter. The Pedersoli measures .458 groove diameter.

[Martini2]

Robert L, You have an interesting paradox with current bullet / bore fit.
In order to pick up a little velocity one could try 3F powder. However that will burn bit hotter and dry fouling so more lube or blow tubing and even possible moist patching bore between shots would accompany 3F. We have an real GURU names Kurt on the site. He has done extensive study on gas cutting of bullet bases etc. It would take very little damage to last driving band on bullet base to cause some down range phenomena. Might try to retrieve a bullet fired into back stop. Since load is already using all available space trading your fiber 0.060" wad for a Poly wad (more durable) material might preserve the flat base. Last take peek at the compression tooling. When putting pretty good pressure down on powder column the tool surface doing the pressing needs to be perfectly flat. If domed it will leave a ring around the edge for bullet base to sit on. This may effect the sealing of hot gases. The devil is in some of these details. Best of luck on the range outing.

[Don McDowell]

The Browning throat is short compared to the Pedersoli. I had to increase the compression in order to seat the bullet deep enough to chamber, just touching the rifling.

Also, the Browning measures .460 groove diameter. The Pedersoli measures .458 groove diameter.

Odd the groove on the BPCR is that large. But you have to go with what you have so get a mould that drops a bullet at .460. Still compressing 70 gr. of 2f should not be a problem and seating to the driving band works rather well in most rifles.
2 different rifles using different loads is pretty common, if you are trying to get the most out of each.