http://www.gtbullets.com/index.php?m...5ji0lnmeit5ad7
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http://www.gtbullets.com/index.php?m...5ji0lnmeit5ad7
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This is a great resource! I will be ordering from them.
Many thanks,
The 220gr actually weigh pretty close to 220 and the 255 RN are also very close to advertised weight. The 250gr Keithers are 253ish grains.
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Oversized cylinder throats and nasty brick wall category thread choke.
.433 -.434
USB; what are the throats on the new gun?
Randy
Here's something I shot this afternoon. This is five rounds loaded with Unique and Speer's 4428 210gr Gold Dot for the 44 Magnum. I blurred out the load data because it isn't anything published. I don't think it is necessarily a hot load and is under some published data for other 210gr bullets.
Anyway, this one really bares further messing with. I've loaded up 20 of this same load and will get some chrono data and shoot into gel ASAP.
https://uploads.tapatalk-cdn.com/201...99ce86222c.jpg
As per my usual this is seated at 25 yards with a rolled up jacket for a rest.
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Here is a group with a 250gr (253 +/- on my digital scale) Keith-style cast hollow point from GT Bullets. These are sized .432" as available from the GT website.
https://uploads.tapatalk-cdn.com/201...6fc137d765.jpg
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Here's something quite surprising.
This is the 210gr Speer Gold Dot loaded with Unique fired into gel both with and without a heavy clothing barrier. The chrono says these are running just at or slightly under 1000fps. Note that the bullet fired into bare gel shows just the tiniest amount of flattening while the clothing bullet shows no expansion whatsoever.
The bare gel bullet penetrated about 28" while the clothing bullet penetrated in excess of 32" and the bullet was found behind the blocks.
This is not the surprising thing since I wasn't expecting too much from a heavy jacketed 44 Magnum bullet at these speeds. I'm hoping that maybe something like Blue Dot can get me up into the 1100fps range to give the bullet enough oomph to actually work.
What is surprising is how well the 255gr RN LHP from GT worked. These are loaded to Skeeter spec and are running in the mid 900's. Penetration both with and without clothing is in the 14-15" range and both bullets opened nicely at these speeds. This load warrants more experimentation but certainly might be a good choice as a field/hiking load where lighter skinned four legged critters might be a threat.
https://uploads.tapatalk-cdn.com/201...f8c4deb8f9.jpg
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In Kuhnhausen's "The S&W Revolvers A Shop Manual 5th Ed." it shows the chamber throats dimensions being 0.4325" min and 0.4365" max for the 44 Magnum. Surprised me the max was so large especially compared to the readings and concerns expressed here. The text below the diagram states the dimensions are "basic industry .44 Magnum cartridge and chamber minimum and maximum dimensions." I came across the diagram while looking for his recommendations on how to measure that dimension and my jaw dropped.
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Another photo. This is the 255gr RN LHP in the gel block.
https://uploads.tapatalk-cdn.com/201...b64189ebd7.jpg
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The SAMMI drawing I have says the throat should be .431+.004/-.000... I previously thought it was .431+/- .002.
Optimally we would like to see .429 grooves, .430-.431 throats, and boolits at .431. That's what my BH Bisley and SBH Bisley are.
I figure Ruger will get this fine point in the Mfg. Process dialed in pretty quickly now that the test guns are coming back.
Randy
My throats are .434 so I have boolets sized and loaded in new Starline brass. I had a bit of thread choke that I fire-lapped out so now I am ready to work on real loads. It's all part of the fun for me. I do like this new GP-100 an awful lot.
Well with this being my first .44 caliber wheelie, and with me always touching up the forcing cone on my revolvers I was very surprised to see how off center the forcing cone on this revolver is. I got it to clean up 80% all around and will shoot it now to see how it groups.
I shot 100 240 grain XTP's after firelapping to help smooth the bore and it grouped fairly large. I blamed it on the throats but seeing this I suspect the off center forcing cone is much more to blame. I have trimmed dozens of them and this is by far the worst one.
http://i798.photobucket.com/albums/y...psikrtcc4w.jpg
http://i798.photobucket.com/albums/y...psuqskujex.jpg
Sorry, I know my pics are not the best. Top pic shows the right side almost cleaned up and bottom pic shows the left side cut heavy.
We'll get this girl to shoot yet :)