When do bullets tumble

For years, Dillon Precision has been the 1 choice of reloaders wordwide. With options for every skill level, we have you covered.

Experience - We practically invented reloading. Our experience is unmatched. We have a reloading solution for you. Durability - Our reloaders go the distance. Most carry a lifetime warranty against breakage and wear. Remember, the 9mm case is slightly tapered - not straight-walled - so if the. I saw this at a match I shot at a couple weeks ago, but in that instance it was obvious that was the problem.

New reloader who figured if a little is good, more must be better. His rounds were so heavily crimped that it swaged the bullet to the point it looked like a heeled bullet for a. Just a thought. If nothing else, the above replies show there could be a myriad of things that cause what you are experiencing. Eliminate one variable at a time.

Good luck. Unless I'm reading the online guide wrong. I used the. The crimp, to me, if anything seems light, but I didn't want to make it too tight, so I mirrored a crimp that I know worked in our guns. Granted, those were for jacketed ammo, but I figured it was a safe place to start. Another thing I'll mention is that when I showed the round to Alex the first thing he said was "looks too long.

I always start within printed charge weights in one of the printed, published books on my shelf and work my way up in. I load to the same OAL and just go to the indoor range and try everything on paper checking each piece of brass for pressure signs.

Whichever powder charge gives me the best group I'll then load. I always try to use the lightest crimp possible, basically just to iron out the belling of the case from the expander die.

I also use a lyman M die to expand. Flattened primers. The first isn't that likely specially in a 9mm, it is more of an issue for rifles worn out 5. The other however is not as unlikely as it may sound. For example I used to shoot gr Zero's and one day they started shooting wild. Turns out the latest batch I had from them was undersized but I had loaded a couple thousandth rounds and they were mixed new batch and old batch in my box of loaded ammo so I pretty much had to write off the whole batch as practice ammo.

With the current shortages and everyone running plants into overtime, I wouldn't be shocked to see some bad batches of bullets floating around. Lets also not forget the other possible causes: worn out barrels and undersized bullets.

A while back I had a huge issue with a case of USAmmo Lol don't listen to this guy he's just a new shooter. You can post now and register later. If you have an account, sign in now to post with your account.

Paste as plain text instead. Only 75 emoji are allowed. Display as a link instead. Clear editor. Upload or insert images from URL. By Bklynracer Started August By ShootersShooter Started 3 hours ago. By Cheflife15 Started November 4. By Sniper Started August 8.

Sign in to follow this Followers 1. As an interesting aside, I recently August, received some information on some ballistic experimentation being done by "an agency" using esoteric "rifles" and specially selected bullets.

The folks involved were routinely getting sub-sub-moa groups at yards in the order of less than 1" but because the "rifles" do not meet IBSA rules they can't claim the record.

Update On July 21, a 1. As an example of what can be done with a BIG caliber rifle the current world record at yards with a. I've been frequently asked this question. As far as I know there are no college "ballistics" programs. What you need is a physics background and a good math foundation. Once you have that you can aim towards the ballistics field from within a job in a related field.

The best place to work used to be at the Ballistics Research Laboratory at Aberdeen Proving Ground but that has been closed and the research is done elsewhere. If you are looking for some up to date reading on the subject try the following books which were written by various experts in the field and not gun rag writers.

Please note that I cannot help you locate these books. The corrections are available in zipped MS Word format by clicking here.

You will need to have the MS Equation Editor installed to properly view the document. Hatcher's Notebook , by Julian S. The above will pretty much cover the subject. However, the following may be of interest to advanced students.

Aerodynamic Data for Spinning Projectiles , H. Krasnov Tr. Deane N. New York Lieske, M. Lowry, Research Dept. Colonel F. The 7. Tests show that while it travels at 1, feet per second at yards, slower than the. The difference can be seen with pistol rounds, as well. Since the mids, gunmakers catering to consumers who increasingly buy weapons for self-defense have produced fewer of the small-caliber handguns like the.

Peter Rhee is a trauma surgeon who operated on victims of the shooting at a political event in Tucson, Arizona, in which six people were killed and 13 wounded in a hail of 9mm bullets. Rhee explained that the more massive the projectile, the more severe the wound. In fact, the. What makes the. When the. At that long distance, the. Slow-motion videos of ballistics tests clearly illustrate this difference.

Watch the. Developed in the early s, the. The U. In the macabre world of terminal ballistics, the study of what happens when projectiles actually strike, much can be made of over-penetration: the phenomenon of bullets passing clean through their targets.

Rifle rounds have an elongated, oblong shape and so they often tumble. When they strike, the bullets rotate, and more of their surface hits the body.