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Rifles, Reloading, Optics, Equipment
Reloading
Why I Crimp
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<blockquote data-quote="Teri Anne" data-source="post: 2418535" data-attributes="member: 118816"><p>I thought the same thing, been doing without for over 50 years without any issues and sub MOA groups were never much of an issue. Then had a discussion after Butter Bean's post and decided to give factory crimping on my 300wm a try since it's group sizes were sub MOA but just barely. Loaded up 20 rounds exactly identical, using Nosler Partition 180 gr bullets and trickled IMR 4350 to produce 3050 fps. I did not chronograph the loads since velocity wasn't an issue for me. The two 5 shot groups without the factory crimp averaged 0.75 MOA between them. The crimped rounds using 1/4 turn brought the next two 5 shot groups down to 0.60 average. Not exactly earth shattering, especially for hunting however when shooting competition at 600 or 1000 yards it can mean the difference between a 10 or an X. The X count is for breaking ties. I have lost more than one match by 1 or 2 X counts. Every little bit helps. All my 300WM rounds are now factory crimped and thinking about doing the .270 and 30-06 too when I'm not up to my butt in snow out at the range. Thank you Butter Bean for turning me onto this trick.</p></blockquote><p></p>
[QUOTE="Teri Anne, post: 2418535, member: 118816"] I thought the same thing, been doing without for over 50 years without any issues and sub MOA groups were never much of an issue. Then had a discussion after Butter Bean's post and decided to give factory crimping on my 300wm a try since it's group sizes were sub MOA but just barely. Loaded up 20 rounds exactly identical, using Nosler Partition 180 gr bullets and trickled IMR 4350 to produce 3050 fps. I did not chronograph the loads since velocity wasn't an issue for me. The two 5 shot groups without the factory crimp averaged 0.75 MOA between them. The crimped rounds using 1/4 turn brought the next two 5 shot groups down to 0.60 average. Not exactly earth shattering, especially for hunting however when shooting competition at 600 or 1000 yards it can mean the difference between a 10 or an X. The X count is for breaking ties. I have lost more than one match by 1 or 2 X counts. Every little bit helps. All my 300WM rounds are now factory crimped and thinking about doing the .270 and 30-06 too when I'm not up to my butt in snow out at the range. Thank you Butter Bean for turning me onto this trick. [/QUOTE]
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Reloading
Why I Crimp
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