Switching from 45acp LSWC to LRN

R

Roland Thunder

New member
I have been using 45acp 200 gr LSWC in my 1911 for several years. I recently bought some 200 gr LRN. I switched because my new gun, Sig 320 FS doesn't feed the LSWC's very well although my Colt 1911 does just fine with them.

The LRN bullets are about .02 shorter than the LSWC's. Should I load the LRNs with a OAL .02 shorter to achieve the same pressure.

I have been using 4.1 gr Bulle Eye Powder
 
No expert here , The one thing I'd do is seat one of each then mark at case mouth . Pull them both and compare how much bullet is being seated in the case . The 45 is a big low pressure case . A few thousandths difference should not make a substantial difference in pressure .
 
Who started the idea that loading to same seating depth would give the same pressure? What about bearing surface and distance to lede/rifling? Is accuracy of any importance? First, the round must feed and chamber.
Try establishing COL for each bullet and ignore seating depth.
Determine COL with a couple of inert dummy rounds.
I know that some don't want to change their load and they want the same PF, but then, why change bullet? Also, don't these folks have chronographs any way?
Always assume a new bullet means a new load work-up.
 
The RNL bullet will probably work better if the rounds are loaded to the same OAL as good ole' factory FMJ ammo.
Then work up the load accordingly.

While a chronograph is indeed a welcome addition to reloading, how did we ever get along without them.
We did, though.
Had to, they didn't become commonly available until fairly recently in the history of reloading.
Serious shooters might make their own chronographs, but mostly we just trusted the loading manuals and seat of the pants testing.
Seemed to work out ok.
 
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LRN bullets are about .02 shorter because they're not flat. OAL for an RN is 1.200", but I wouldn't worry about 20 thou too much. The .45 is a forgiving fellow.
 
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