ProGun
.30 Stingray
Posts: 246
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Post by ProGun on Oct 24, 2016 6:41:36 GMT -5
So I want to try this DEEP SEATING business, but I don't want to guesstimate seating depth. I was hoping someone could give me numbers on how to DEEP to SEAT a 45-270-SAA bullets (0.745") in .454 Casull brass (Trim to 1.380"- Max 1.385"). I charging the load with Universal.
Thanks in Advance.
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Post by zeus on Oct 24, 2016 6:49:06 GMT -5
Why not just seat to the top of the front driving band? But....is there a specific reason you are wanting to do this to start with?
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ProGun
.30 Stingray
Posts: 246
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Post by ProGun on Oct 24, 2016 8:08:32 GMT -5
Why not just seat to the top of the front driving band? But....is there a specific reason you are wanting to do this to start with? Bradshaw talks about it quite often, which leads me to think I should try it. Plus, I typically use loads at the lower end of the .454 power spectrum, so my load density isn't as optimum as it should be, or could be potentially be with deep seating. How far past the front driving band? .002? |
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Post by bradshaw on Oct 24, 2016 9:04:07 GMT -5
So I want to try this DEEP SEATING business, but I don't want to guesstimate seating depth. I was hoping someone could give me numbers on how to DEEP to SEAT a 45-270-SAA bullets (0.745") in .454 Casull brass (Trim to 1.380"- Max 1.385"). I charging the load with Universal. Thanks in Advance. *** ProGun.... length of case does not matter. The critical measurement----and it is not very critical----is to seat the bullet so that the front band is buried .030 to .060-inch below the case mouth. In this fashion, the crimp does not squeeze into the lead. The crimp sits above the front band. In shooting cast .452" 270 SAA Hollow Points (average 276 grains) DEEP SEATED in .45 Colt brass, groups from my Freedom Arms Casull (4-3/4") and Ruger 03 (5-1/2") are grapefruit-tight a football field away. Loads and groups pictured in the Volume series in the Gallery section. Favored loads include 13.1 to 13.5 grains/HS-6, .45 Colt case, standard large pistol primer. For deep seating in .454 Casull brass I'd start with a grain more powder----14/HS-6----and sandbag at a target far enough away to be fuzzy on your front sight. Most of the cast bullets which have been shot through the M83 and the Ruger 03, both conventionally seated and DEEP SEATED, group about the same @ 100 yards. Efficiency of light and moderate loads favors deep seating, as it requires one to two grains less powder, and velocity Extreme Spread tends to be slightly less. The measure for deep seating is between front band and case mouth. Case length itself is not a factor. Deep seating also works for slow powders, including 296/H110. IMR and H4227, even the faster Hercules and now Alliant 2400. David Bradshaw |
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ProGun
.30 Stingray
Posts: 246
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Post by ProGun on Oct 24, 2016 11:14:09 GMT -5
So I want to try this DEEP SEATING business, but I don't want to guesstimate seating depth. I was hoping someone could give me numbers on how to DEEP to SEAT a 45-270-SAA bullets (0.745") in .454 Casull brass (Trim to 1.380"- Max 1.385"). I charging the load with Universal. Thanks in Advance. *** ProGun.... length of case does not matter. The critical measurement----and it is not very critical----is to seat the bullet so that the front band is buried .030 to .060-inch below the case mouth. In this fashion, the crimp does not squeeze into the lead. The crimp sits above the front band. In shooting cast .452" 270 SAA Hollow Points (average 276 grains) DEEP SEATED in .45 Colt brass, groups from my Freedom Arms Casull (4-3/4") and Ruger 03 (5-1/2") are grapefruit-tight a football field away. Loads and groups pictured in the Volume series in the Gallery section. Favored loads include 13.1 to 13.5 grains/HS-6, .45 Colt case, standard large pistol primer. For deep seating in .454 Casull brass I'd start with a grain more powder----14/HS-6----and sandbag at a target far enough away to be fuzzy on your front sight. Most of the cast bullets which have been shot through the M83 and the Ruger 03, both conventionally seated and DEEP SEATED, group about the same @ 100 yards. Efficiency of light and moderate loads favors deep seating, as it requires one to two grains less powder, and velocity Extreme Spread tends to be slightly less. The measure for deep seating is between front band and case mouth. Case length itself is not a factor. Deep seating also works for slow powders, including 296/H110. IMR and H4227, even the faster Hercules and now Alliant 2400. David Bradshaw I'm shooting the same FA 83 4 3/4", but I only have the .454 cylinder. Thanks for the input (Zeus too!), I'll give her a go. |
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Post by michigandan on Aug 25, 2023 13:14:26 GMT -5
I am experimenting with M-E cast 45-270SAA as well. My alloy comes out at 282 grains. I sized mine to both 0.451 and 0452. Under 8.0,grains of Unique or 14.9 grains of 2400, both seated just over the front diving band at 1.552” o.a.l. I find no difference in accuracy at under 25 yards, which is my preferred distance with iron sights. I’m sorry, but I haven’t ant velocity data, waiting for a new crony at this time. Theses were fired using twice fired Starline brass which dropped out if my Bisley cylinder effortlessly.
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