I have Browning 1885 Single shot that shoots old Federal Premium 150 gr. BTSP ammo darn near into the same hole. I'm getting 3150 fps out of the 28' bbl. I would like to try and duplicate the round, but I don't know what bullet they used at the time. Sierra, Speer? Hard to tell by just looking, but the bullet has no cannelure so Im pretty confident its not a Hornady bullet. Thanks
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Most of the variation with a load is about harmonics. If we get a bullet that is close to the same and hit that velocity you will be close enough to play with bullet seating depth.
Caliber? You failed to mention that. -
Probably not going to happen. Most factory loads use a composite or compound powder (mix of multiple powders). It's generally not a good idea to try to mix since you don't know how the powders will react.
You are better off choosing that bullet and find a load that will get your velocity close without pressure signs
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Oh and if it's a federal load it's either going to be a Sierra or a nossler
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I checked again...
and it does have a cannelure. The harmonics is what I wanna duplicate and thought I would start with the bullet. I now I can't mix powders, but I can use what I have to try and duplicate the velocity. This ammo is probably from the early 90's.
I'm down to 1 full box of 7mm mag I think. It has the old orange ammo carriers in it.
Sierra and Nosler don't list a bullet in 7mm/150 gr. with a cannelure.Comment
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Or you could just go berger and work up a new load. I can get those shooting 1 hole out of almost anything.......including a 1917 Winchester Enfield with original barrel.Comment
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Why don't you call Federal and ask them what bullet was used in that ammo? Can't hurt to try.
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Federal loads Sierra, Nosler, and Barnes bullets in their factory ammo. Bullet manufacturers often make runs of bullets with cannelures for ammo manufacturers because the ammo manufacturers often prefer to crimp their factory loads. Crimping keeps the bullets from moving in the case. I crimp very few loads and calibers mostly because they just don't need to be, but manufacturers don't know how long that one cartridge is going to sit in the bottom of the magazine getting battered by recoil, so they crimp to keep the bullet from being pushed into the brass and compressing the powder charge. Crimping is best done into a cannelure thus the runs of bullets with cannelures.
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I emailed Federal...
and gave them the lot number which they told me the ammo was manufactured in 1991, but they need another number off the side of the box. Gave them that and they told me it was a Sierra Game King. I didn't think Sierra used a cannelure and Federal said that they put the cannelure in the bullet before loading it. I've never used the cannelure in 30 years of loading. I always seat the bullet to the max the magazine will allow or off the lands using a bullet comparator.
That's ok. Now to order some 150 gr. 7mm Game Kings and start experimenting.Comment
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