Interpolating loads


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lee n. field
October 18, 2003, 09:11 PM
I've done it again.

I picked up a couple bags, 400 bullets in all, of what are labeled as "190gr LSWC" for loading .45 ACP.

And I can't find any data on that weight of lead bullet.

Now, Lyman's 47th edition lists a 185gr and a 195gr lead bullets. For Bullseye (the powder I have on hand right now) both range from starting charge of 3.5 grains to a maximun of 5 grains.

Safe to interpolate?

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P95Carry
October 18, 2003, 09:19 PM
Had your dilemma lee ..... more than once. IMO yeah you can interpolate but ... using the ''10% under'' rule of safety probably.

Your data suggests that a reasonable and safe starting load could be perhaps around 4.3 to 4.4 grns .... probably ''warm'' but good for cycling, but not too much risk of over pressure etc. The low end figures would probably not be enough to cycle.

Mind you .... just me ... I am not a fan of Bullseye for this cal .. prefer to go to a powder that is a tad slower and bulks better .. maybe Unique for instance.

WESHOOT2
October 18, 2003, 10:12 PM
Lesseenow, interpolated loads..............

400 C-B; never found the fired cases. Indoor military range.
44 Mag, 300g LTC @ 1800fps; Ruger service great.
1.130" 220g 40 S&W: DON'T TRY THIS.
180g 357 Mag; can I get 2000fps? Story unfolding.............
9 Major; need loupe to examine slide-n-frame for cracking.
170g 41 Mag; can I get 2000fps? Story unfolding.............
230g FMJ for 'driving' comp; thank you Alliant for Power Pistol.
etc.

BTW, my wrist hurts.


"190g"; what do they actually weigh?
After determining that particular tidbit suggest using 200g LSWC data. That's probably the safest course.

lee n. field
October 18, 2003, 10:19 PM
"190g"; what do they actually weigh?
After determining that particular tidbit suggest using 200g LSWC data. That's probably the safest course.

That I'm going to have to determine. (My scale is the little Lee scale, which tops out at 100 grains, but I can borrow a buddy's.)

The bullets appear to be identical to Lee's 452-190-SWC (3 bands, slightly rounded top).

WESHOOT2
October 18, 2003, 10:23 PM
I have over 75 different types of handgun bullets on my bench; guess how many weigh what the box they came in says?

C.R.Sam
October 19, 2003, 02:39 AM
"190g"; what do they actually weigh?
After determining that particular tidbit suggest using 200g LSWC data. That's probably the safest course....Tim
Concur.

Especially with cast bullets....often they weigh different than label.

Some go by nominal weight for the mold, then when cast with different alloy, they come out different.

Sam

GooseGestapo
October 22, 2003, 12:42 PM
RE: Actual weight, what others said already.

But FWIW, for the purpose of what you're wanting to do with the bullets you have, and what they are intended for, just going with 200gr data is wholly acceptable.

I have several bullet moulds for the bullet you have described:
1. Is the two cavity Lee 190swc-.452", casts at 195.0gr +/-
2. Six cavity version of above casts at 192.5gr +/-
3. A 200gr .452" RNFN casts at 205gr +/-
4. A 200gr .452 H&G #86 style SWC; casts at 205gr +/-

I load all over 3.8gr of Bullseye for approx. 700fps.

The H&G style SWC is the most accurate and reliable functioning. The 190gr SWC must be seated essentially in the foward lube groove to properly function in the guns I've shot it in. The H&G, I normally seat to 1.275" and is as reliable as 230RN feeding and gives One-hole accuracy if gun is capable. (I got a 2.0" 6 shot group at 50yds with a friends custom built Caspian 1911 w/Barsto bbl built by David Sams of Cartersville,VA)

I'm not as fond of the 190 SWC, though it works better with Lee Tumble lube. The H&G style practically insists on being run through my Lyman 450 lubrisizer, and sized to .452"
FWIW:
Last Monday was a week ago, I killed a whitetail doe with the H&G style 205gr fired through my Muzzle loader with a MMP .50/.452" sabot over 80gr Pyrodex RS. Its the most accurate saboted bullet through my M/L too! I believe the bevel base is largely responsible for the accuracy of this design. It gives good gas deflection on departure from .452" bbl, and gives consistent release from the sabot with minimum disturbance of bullet.

labgrade
October 22, 2003, 03:34 PM
Why Not?

& just for grins, why not throw a caliber/mike on a couple to make sure they're the ccorrect diameter?

Couple (at least) "45s" out there & not all are for the ACP. A larger diameter with a towards max load would suck.

Doing a quick sample check of any new box of bullets as always a good idea. Ran across a box of 124grs 9mms once when marked as 115s for a really max load. Likely not enough to matter (maybe), but enough to set me back to the basics (again ;) ).

lee n. field
October 26, 2003, 09:59 PM
"190g"; what do they actually weigh?

Borrowed my buddy's scale, checked it with check weights, and weighed a half dozen of the "190 grain" bullets. Measured weight ranged from 191 to 196 grains, so I guess I work from the 195 grain LSWC data.

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