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Old 05-26-2012, 06:55 PM   #1
SundevilSG
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Default .45 acp, 200gr SWC COL too short?

Hey folks,

After blasting off a ton of 230gr LRN i've decided to give 200gr SWC (HSM Custom hard cast) a try. I made a few test round this morning and found that the lands of the rifling seem to be set further forward on this gun than I previously thought. STI Spartan .45ACP - all stock.

Using in-spec cases, I have to seat the bullet to 1.07" before it will drop in and out of the barrel and head space correctly. What the heck is going on? My 230gr LRN loads are seated to 1.250" and work fine.

I scrubbed and used a lead solvent on the barrel which helped a bit, but im still confused. At 1.15" the case shoulder overhangs a little more than 1/32" unless pushed in flush.

Lyman 49th claims that 1.235 is the minimum OAL, but another 200 gr SWC in the same manual lists 1.161" as minimum.

Others online seem to be running this bullet at 1.250" just fine. Is my barrel out of spec?
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Old 05-26-2012, 07:04 PM   #2
mad_spaniard
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1.225 should be the 'starting' OAL ..

What barrel do you have?
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Old 05-26-2012, 07:29 PM   #3
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Im not sure if the barrel is manufactured by Armscor or STI. I seem to remember the barrel being an STI Match, but I could be wrong.

It is the stock one shipped with the pistol. 5" Gov't length
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Old 05-26-2012, 08:19 PM   #4
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Apparently the barrel was more leaded than I thought. I soaked it in shooter's choice lead solvent for about 20 minutes and got it shiny throughout. I was able to load one to 1.250" and have it head space correctly when dropping in. It still takes a bit of resistance to remove it, but I think I'll give it a shot.

Further complicating things, now the tip of the bullet is hanging up on the throat of the barrel. The round does want to feed when operating the slide slowly, but allowing it to slam forward under the recoil spring will do it. My LRN loads feed very smoothly. Not too surprised by this.

I'll make a small batch at starting load (5.4gr W231) and try a few at increasing powder loads. I'm guessing that it will take a bit of extra slide velocity to fully chamber.
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Old 05-26-2012, 10:12 PM   #5
mad_spaniard
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4.2 Clays with 200 SWC @ 1.220 never failed me for 45Major USPSA, next time I do a batch I will make some for you.

1.250 seems a bit too long to me
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Old 05-27-2012, 01:36 AM   #6
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Just play around with the COAL starting at the minimum COAL and see which length your barrel likes. Also check your magazine because not all magazines functions well to every pistol. For instance my SA and COLT 1911 didn't like WC magazine but these pistols functioned flawlessly with the Chip McCormick 7 round match mags. I've read some people have to turn theirs to a Gunsmith to get the feed ramp adjusted.
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Old 05-27-2012, 02:46 AM   #7
rat907
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Heres a suggestion:

-prep a case and lightly seat a bullet just so its held in the brass.

-chamber it and eject it into hand

-measure the O.A.L.

-load new test round .002-.003" shorter with normal crimp

-load in magazine and check feed and ejection

-if all is good, load 3 test rounds with specified loadings and testfire for function

*note* this is not an exact science, so be cautious and assume the dangers of walking in uncharted territory!
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Old 05-29-2012, 10:56 PM   #8
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IIRC the SAAMI minimum OAL is 1.19".

I've noticed that some of my bullets are much shorter than others so even though the OAL is shorter, the bullet isn't seated any deeper.
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Old 05-30-2012, 12:06 AM   #9
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Do you want to get together? I'm at Trop/Rainbow

Something is not right (somewhere)
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