I loaded 20 crimped and 20 not crimped. both were 180gr SST's with 73 grains of H4831SC, rem brass, fed210m. both shot well at 110 yards.I did notice that the crimped did shoot different.they hit about a half inch high and o the right but grouped well.I even got a guy the was shooting next to me to shoot a few and his grouped in the same place.as for FPS i didn't have a crony with me.also i tumbled the brass and trimed them last night and the crimped shells did need to be trimed and the one's not crimped didn't need to be trimed.all was virgin brass.
i will test 20 and 20 more this up comeing weekend to see if it works about the same on different days. but i think crimping might help out for me at 300 plus yards.
THANKS for all the info you guys have let me in on...
“If you keep doing what you’re doing, you’ll keep getting what you’re getting.”
I get a 5FPS Extreme spread with my uncrimped loads,don't think crimping is going to close that up much.
Accuracy is about eliminating variables,not adding them.
[Quote] by BigDaddy0381
"also i tumbled the brass and trimed them last night and the crimped shells did need to be trimed and the one's not crimped didn't need to be trimed.all was virgin brass." [Quote]
Already he is experiencing a variable that leads to the thining of the the case just in front of the head and if loaded enough times will cause case head seperation... Anything that you think you are solving by crimping can be solved better in other ways.Better SD and lower extreme spreads can and always have been solved by tweeking the powder charge and or changing to a different primer.....
range it,check the wind, dial in correction, aim and only one shot
If crimping gives lower SD's, than it simply means you're not using enough powder without crimping or you need a faster pressure curve powder to optimize harmonics. Or you need to increase bullet grip using a bushing die. That will increase neck tension and still maintain good concentricity.
Crimping makes your loaded ammo almost impossible to keep concentricities running good.
I only crimp my handgun ammo and I always use a taper crimp-never a roll crimp even at that. [img]/ubbthreads/images/graemlins/wink.gif[/img]
I will agree that from time to time crimping will produce a better group, but that only tells you something is major wrong with your uncrimped load. Jwp475 is right, it only adds a avariable to complicate things more, Goodgrouper is rigt on with the concentricity issue. Well you all can see which side I take. No crimping for me. I stopped crimping over 30 years ago. As they say, to each his own, if you're happy crimping just knock your self out and be happy. [img]/ubbthreads/images/graemlins/smile.gif[/img]
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This very much seems like a bullet debate! Some love a SMK for big game and others decry it! Some folks full length size every time, some neck size only, some uniform flash holes some don't!
What one person does to achieve their results is their business, and IMO is neither right nor wrong, it is just their way to get there.
You can machine parts on a 150,000 dollar CNC lathe or make the part using a file and some patience, but if the results are the same then they are the same.....and sometimes it is the journey that makes the trip worthwhile.
Perhaps changing powder/load/bullet/..... will give you the same result, but how many shots do you have to put down the bore to find a better load? If you do find a better load, then does that mean that there is or is not another load that is even more accurate? You can do "what ifs" forever, or you can shoot, your choice.