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Red Dot, .45 ACP LRN and Min OAL

This is a discussion on Red Dot, .45 ACP LRN and Min OAL within the Reloading forums, part of the Firearm Forum category; " Bullets-Keep in mind that seating depths can cause noticeable changes in ballistics. This is especially true for handgun ammunition. It is strongly suggested that ...


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Old February 17th, 2017, 11:27 PM   #1
 
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Red Dot, .45 ACP LRN and Min OAL

" Bullets-Keep in mind that seating depths can cause noticeable changes in ballistics. This is especially true for handgun ammunition. It is strongly suggested that specific cartridge overall length be used as shown." I quote page 118 Lyman's Reloading Handbook 49th Edition.
I am shooting Alliant Red Dot, using a minimum recommended starting charge 0f 4.5 Grains under a 230 grain LRN Oregon Trail .45 ACP Bullet. According to Lee's modern reloading second edition, page # 574. They suggest a Min OAL at 1.270 but and I am seating at 1.240
The reason for seating at 1.240 is they run like butter thru my new Ruger SR-45. I see no signs of pressure problems like a flattened primer. My Ruger likes them, I like them, and they are nice and snappy like a factory load. My question is this, should seating depth be left up to the discretion of the reloader and is the recommended OAL set in stone? Thanks Friend's



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Old February 17th, 2017, 11:55 PM   #2
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No it is not set in stone. It is a recommended guide that may vary depending on gun, magazine or accuracy. You just must be careful that you do not allow it to be seated an excessive amount over the recommendation as it will increase PSI.
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Old February 18th, 2017, 04:41 AM   #3
 
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Like HBK stated , No. The loaded round has to fit into your magazine , feed from magazine , up and into chamber and fully chamber in your particular pistol. So in reality your gun sets it's OAL . The book OAL gives you a place to start . Slight variances are not dangerous except possibly at maximum loads and these should be worked up to .
Too many obsess excessively about exact OAL , but don't it's not set in stone.
When I started reloading (1967) OAL's were not even listed, we used a factory round to set seating dies, in the case of 45 acp and 200 grain cast lead SWC's , we were instructed to seat the bullet so a "thumb nail thickness" of the top band protruded from the case.....
Of course I did that and it worked ! I still have no idea what that OAL measures.
Things sure have changed. But adjust that OAL as needed and don't worry.
Gary
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Old February 18th, 2017, 05:49 AM   #4
 
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Thanks gwpercle-- You told me what I suspected.

"So in reality your gun sets it's OAL"

This is what the SR-45 has done. It would not fully go into battery at 1.270 but functions flawlessly at 1.240 this is for LRN only. FMJ at 1.270 work fine. I have only been reloading for three years on a casual basis. I sold a wonderful sig 227 and used some of the proceeds to buy the SR-45. I have small hands and the Sig was not working for me. The SR-45 is also a wonderful gun and I am really happy that I bought it.
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